1 And after him rose up Nathan to prophesy in the time of David. 2 As is the fat taken away from the peace offering, so was David chosen out of the children of Israel. 3 He played with lions as with kids, and with bears as with lambs. 4 Slew he not a giant, when he was yet but young? and did he not take away reproach from the people, when he lifted up his hand with the stone in the sling, and beat down the boasting of Goliath? 5 For he called upon the most high Lord; and he gave him strength in his right hand to slay that mighty warrior, and set up the horn of his people. 6 So the people honoured him with ten thousands, and praised him in the blessings of the Lord, in that he gave him a crown of glory. 7 For he destroyed the enemies on every side, and brought to nought the Philistines his adversaries, and brake their horn in sunder unto this day. 8 In all his works he praised the Holy One most high with words of glory; with his whole heart he sung songs, and loved him that made him. 9 He set singers also before the altar, that by their voices they might make sweet melody, and daily sing praises in their songs. 10 He beautified their feasts, and set in order the solemn times until the end, that they might praise his holy name, and that the temple might sound from morning. 11 The Lord took away his sins, and exalted his horn for ever: he gave him a covenant of kings, and a throne of glory in Israel. 12 After him rose up a wise son, and for his sake he dwelt at large. 13 Solomon reigned in a peaceable time, and was honoured; for God made all quiet round about him, that he might build an house in his name, and prepare his sanctuary for ever. 14 How wise wast thou in thy youth and, as a flood, filled with understanding! 15 Thy soul covered the whole earth, and thou filledst it with dark parables. 16 Thy name went far unto the islands; and for thy peace thou wast beloved. 17 The countries marvelled at thee for thy songs, and proverbs, and parables, and interpretations. 18 By the name of the Lord God, which is called the Lord God of Israel, thou didst gather gold as tin and didst multiply silver as lead. 19 Thou didst bow thy loins unto women, and by thy body thou wast brought into subjection. 20 Thou didst stain thy honour, and pollute thy seed: so that thou broughtest wrath upon thy children, and wast grieved for thy folly. 21 So the kingdom was divided, and out of Ephraim ruled a rebellious kingdom. 22 But the Lord will never leave off his mercy, neither shall any of his works perish, neither will he abolish the posterity of his elect, and the seed of him that loveth him he will not take away: wherefore he gave a remnant unto Jacob, and out of him a root unto David. 23 Thus rested Solomon with his fathers, and of his seed he left behind him Roboam, even the foolishness of the people, and one that had no understanding, who turned away the people through his counsel. There was also Jeroboam the son of Nebat, who caused Israel to sin, and shewed Ephraim the way of sin: 24 And their sins were multiplied exceedingly, that they were driven out of the land. 25 For they sought out all wickedness, till the vengeance came upon them.
[AD 856] Rabanus Maurus on Sirach 47:2
When it says that Nathan, like the fat of salvation, was separated from the meat, it indicates that he was full of the grace of the Holy Spirit and that his conduct and his life were far from and foreign to those of carnal and sinful people.

[AD 253] Origen of Alexandria on Sirach 47:19
If you reread what is written of Solomon, you will find that he, though being extremely wise, “drew near to many women,” whereas the law of God says, “Do not have many wives, that they might make you commit fornication against your God.” Even he, though extremely wise and of great merit before God, was nonetheless deceived, because he gave himself to many women. I think that the many women refer to the many dogmas and the various philosophies of the peoples: wanting to know and investigate them, as a man rich in knowledge and wisdom, he could not keep himself within the rule of the divine law. He was seduced by the philosophy of Moab, which persuaded him to sacrifice to the idol of Moab, and likewise to that of the Ammonites and of the other peoples. It is said that he received many women, building temples and sacrificing to their idols. Therefore: it is a great thing and truly a work of God to mix with many dogmas as with women and nevertheless to not deviate from the rule of truth but to say firmly, “There are sixty queens, and eighty concubines and young maidens without number, but one alone is my dove, my perfect one, the only daughter of her mother, the only daughter of the one who bore her.”

[AD 856] Rabanus Maurus on Sirach 47:25
This wicked innovation was perpetuated among the people of the ten tribes until the Lord enacted his revenge and they were deported to Assyria. When it says, “Until their justification came, and he freed them from all their sins,” I think it refers to the justification and freedom of our Savior, who at his coming frees and protects from every enemy those who have turned to faith in him and have been purified from all their sins through baptism in him.