2 And Hezekiah was glad of them, and shewed them the house of his precious things, the silver, and the gold, and the spices, and the precious ointment, and all the house of his armour, and all that was found in his treasures: there was nothing in his house, nor in all his dominion, that Hezekiah shewed them not.
[AD 220] Tertullian on Isaiah 39:1-2
In the parable of the rich man, he flattered himself about the increase of his fields. But God said to him, “Fool! This night your soul is required of you; and the things you have prepared, whose will they be?” It was the same way when King Hezekiah heard from Isaiah the sad doom of his kingdom after he had gloried before the envoys of Babylon in his treasures and the deposits of his precious things.

[AD 339] Eusebius of Caesarea on Isaiah 39:1-2
Now, when the Babylonians heard about Hezekiah’s healing from the sickness, they sent ambassadors to him, and not without reason. Indeed, on the day when the sun went backward, one extra hour was added to the duration of the day, which did not elude the Babylonians, who were skilled in their observation of the stars. And as they venerated the sun as divine, they perceived that it was turned back by a superior power. Therefore they were eager to investigate the cause of the phenomenon. Thus driven by curiosity, they learned that the God of the Hebrew people was great and that he was the Creator of the world. When Hezekiah was healed, through which also the miracle of the sun took place, they perceived what happened and strongly desired the friendship of Hezekiah as a man loved by God. That is the story of the Jewish teacher.However, I grasped that all of the following events happened the same year: the attack of the Assyrians against the Jewish people, the defeat of the Assyrians by the angel of God, Sennacherib’s escape, the revolt of his subjects and the death of the son who succeeded him, which is not mentioned in this text. It is likely that the rumor about all those events reached the Babylonian king, who showed friendship toward Hezekiah and sent him gifts, an ambassador and letters.

[AD 373] Ephrem the Syrian on Isaiah 39:1-2
You juxtaposed [events] so that you might not grieve us and that you might save them. Those who had seized our silver brought gold. Those who had wounded our bodies brought myrrh. Those who had burned our sanctuary offered frankincense to your divinity.The myrrh [of the Magi] intercedes for their swords with which they killed us. Their gold intercedes for our treasures, for they plundered the treasuries of the house of Hezekiah. Their frankincense appeases your divinity, for they had angered your Father.…
The Babylonians, too, came up [and] afflicted the children in Judah. By you the children have found peace, for by you the vicious have become worshipers. Those who despised old men honor a Child who is older than all.
Babylon, too, sent offerings to Hezekiah; the envoys who saw his treasures were amazed. What did you show to the Magi? You showed a wonder, for they rendered you homage although you were poor. However great was the ivory palace of the kings of our people, greater and more beautiful is the little cave in which I bore you.

[AD 420] Jerome on Isaiah 39:1-2
(Chapter 39, verses 1 onwards) At that time Merodach Baladan, son of Baladan, king of Babylon, sent letters and gifts to Hezekiah, for he had heard that he had been sick and had recovered. And Hezekiah was pleased with them; and he showed them his treasury, the house of his precious things, the silver, the gold, the spices, the precious oil, his whole armory, and all that was found in his treasuries. There was nothing in his house, nor in all his dominion, that Hezekiah did not show them. Above we read that in the fourteenth year of the reign of King Hezekiah, Sennacherib, the king of the Assyrians, ascended over all the fortified cities of Judah and captured them. Then he besieged Lachish, passed through Libnah, sent part of his army to Jerusalem, and slaughtered one hundred and eighty-five thousand of his soldiers. He himself fled to Nineveh and was killed by his sons in the temple of his god. After that, his son Esarhaddon reigned in his place. Hezekiah became sick but was saved by a message from the prophet. A remarkable sign occurred when the sun turned back ten hours and nearly became a two-day event. Now we read that in that time, that is, in the same year in which all these things happened, Merodach Baladan, son of Baladan, king of Babylon, sent books and gifts to Hezekiah; not Assaraddon, who had succeeded his father Sennacherib as king of the Assyrians, of whose death or life Scripture is silent. From this it is clear that there was another kingdom of the Assyrians and another of the Babylonians at that time. Finally, the Assyrians captured Samaria, that is, the ten tribes. But we read that Jerusalem was later conquered by the Chaldeans, whose king was Nebuchadnezzar. And because they practice the observation of the stars and have acquired knowledge of the courses of the stars through long use and exercise, which is also demonstrated in the birth of the Lord: they understood that the sun had reversed its course, the length of the day doubled, and they believed that it served the only true God. And when they investigated the causes and reason for this miracle, with the rumor spreading to all nations, they learned that due to the illness of the king of Judah, even the course of the most brilliant constellation had changed. That it is not my opinion, but the faith of the Holy Scriptures, which testify with the words of Isaiah, who said among other things: Hezekiah himself, who closed the upper springs of the waters of Gihon and diverted them below to the west of the city of David. In all his works he prospered in whatever he desired; however, when the ambassadors of the princes of Babylon, who had been sent to him to inquire about the sign that had happened on the earth, God left him to be tested and to make known all that was in his heart (2 Chronicles 32:30, 31). Therefore, he was left to temptation because after such a great victory, and the return of the sun, and the congratulations of the most powerful kingdom, his heart was lifted up. Finally, in the same volume it is written: Many brought offerings and sacrifices to the Lord in Jerusalem, and gifts to King Hezekiah of Judah, and he was exalted in the sight of all the nations. In those days he became sick unto death, and he prayed to the Lord, and He heard him, and gave him a sign; but He did not repay him according to the benefits he had received, for his heart was lifted up and wrath came upon him, and upon Judah and Jerusalem (2 Chronicles 32:23-24). And the holy Scripture again says that the exaltation of his heart was tempered by repentance, stating: 'And he was humbled thereafter, because his heart was lifted up, both he, and the inhabitants of Jerusalem: and therefore the Lord's wrath came not upon them in the days of Hezekiah.' So he rejoiced at the arrival of the ambassadors of Merodach, whom the Hebrews consider to have been the father of Nebuchadnezzar; and in the bringing of gifts, and in the celebration of his health. And he showed them the house next to the Septuagint, which was translated by Symmachus for his spices; and the treasures of silver, and gold, and fragrances, and the best ointment: which is written in Hebrew, good oil; and all the treasures of the vessels of the treasure, or, as it is read there, of his vessels. But in the Persian language, riches are called Gaza: it is not a Hebrew word, but a Barbarian one. He said, there was no word (which according to Hebrew custom is often taken for a thing), that he did not show them in his house and in all his power. Wherefore God's most just wrath, since he manifested not only his treasures and palaces, but also the Temple: which surely was in his power, from whose gates he had already taken sheets of gold.

[AD 604] Gregory the Dialogist on Isaiah 39:1-2
Often the care of government when undertaken distracts the heart in many different directions. The ruler finds himself unequal to the task of dealing with particular things when his mind becomes confused, having its attention diverted by so many different things.… When one, because of this, neglects the business of self-examination, that person does not even consider the losses it is suffering or know how great they are. For neither did Hezekiah believe himself to be sinning when he showed to the strangers who came to him his storehouses of spices. He fell under the anger of the judge, however, and his future offspring were condemned because of what he supposed himself to be doing lawfully. Often, when means are abundant and many things can be done for subordinates to admire, the mind exalts itself in thought. But in so doing, it also provokes the anger of the judge, even though the acts of iniquity may have not been overt. For the one who judges us is within, as is that which is judged. When, then, in our hearts we transgress, what we are doing within ourselves is hidden from men. And yet in the eyes of the Judge we sin.