10 Now when Daniel knew that the writing was signed, he went into his house; and his windows being open in his chamber toward Jerusalem, he kneeled upon his knees three times a day, and prayed, and gave thanks before his God, as he did aforetime.
But let not your fasts be with the hypocrites; for they fast on the second and fifth day of the week; but do ye fast on the fourth day and the Preparation (Friday). Neither pray as the hypocrites; but as the Lord commanded in His Gospel, thus pray: Our Father who art in heaven, hallowed be Thy name. Thy kingdom come. Thy will be done, as in heaven, so on earth. Give us to-day our daily (needful) bread, and forgive us our debt as we also forgive our debtors. And bring us not into temptation, but deliver us from the evil one (or, evil); for Thine is the power and the glory for ever. Thrice in the day thus pray.
Verse 10. "Now when Daniel learned of it, that is, of the law which had been enacted, he entered his house, and with the windows in his upper room opened up in the direction of Jerusalem, he continued to bow his knees three times a day and worshipped, and made confession before his God just as he was previously accustomed to do." We must quickly draw from our memory and bring together from all of Holy Scripture all the passages where we have read of domata, which mean in Latin either "walled enclosures" (menia) or "beds" or "sun-terraces," and also the references to anogaia, that is, "upper rooms." For after all, our Lord celebrated the passover in an upper room (Mark 14:15, Luke 22:12), and in the Acts of the Apostles the Holy Spirit came upon the one hundred and twenty souls of believers while they were in an upper room (Acts 1:13). And so Daniel in this case, despising the king's commands and reposing his confidence in God, does not offer his prayers in some obscure spot, but in a lofty place, and opens up his windows towards Jerusalem, from whence he looked for the peace . He prays, moreover, according to God's behest, and also according to what Solomon had said when he admonished the people that they should pray in the direction of the Temple. Furthermore, there are three times in the day when we should bow our knees unto God, and the tradition of the Church understands them to be the third hour, the sixth hour, and the ninth hour. Lastly, it was at the third hour that the Holy Spirit descended upon the Apostles (Acts 2:15) . It was at the sixth hour that Peter, purposing to eat, ascended to the upper room for prayer (Acts 10:9). It was at the ninth hour that Peter and John were on their way to the Temple (Acts 3:1).
And so in the monasteries of Palestine and Mesopotamia and all the East the services of the above-mentioned hours are ended each day with three psalms apiece, so that constant prayers may be offered to God at the appointed times, and yet, the spiritual duties being completed with due moderation, the necessary offices of work may not be in any way interfered with: for at these three seasons we know that Daniel the prophet also poured forth his prayers to God day by day in his chamber with the windows open. Nor is it without good reasons that these times are more particularly assigned to religious offices, since at them what completed the promises and summed up our salvation was fulfilled. For we can show that at the third hour the Holy Spirit, who had been of old promised by the prophets, descended in the first instance on the apostles assembled together for prayer.
The psalmist instructs us to allot three periods a day to God when he says, “At evening, at morning and at midday I shall speak what I have to say, and you will hearken to my voice.” For those three periods while Daniel diligently beseeched God, not only did they obtain foreknowledge of the future, but he also merited the freedom of his people held captive for so long.
Note how much this verse implied in a few words in mentioning the piety and courage of blessed Daniel. First, when Daniel learned that the decision has been reached, “he went into his house”—that is, when he got news of the passing of the law, he had great scorn for it and continued openly doing the opposite. It next mentions a further detail that reveals his courage: the windows were open, it says—in other words, he said his prayers not in secret but openly, with everyone watching, not for vainglory but in scorn for the impiety of the law.
When blessed Daniel in Babylon prayed, he opened the windows facing Jerusalem, not under the impression that God was confined there but from his knowledge that the divine manifestation occurred there.
He did this not only to provoke his accusers but also to fulfill an ancient law: when Solomon built that famous temple and celebrated the festival of consecration, he prayed a prayer of supplication for divine grace and implored that the temple be filled with it, adding this in addition to other things, “If you surrender your people to their foes, and they take them as captives to a land distant or near, and they have a change of heart in the land where they are transported and pray to you in their exile in the words, We sinned, we did wrong, we broke the law, and they turn back to you with their whole heart and with their whole soul in the land of their foes where you transferred them, and they pray to you toward their land which you gave their ancestors, and the city that you chose and the house that I built to your name, may you hearken from heaven, forthwith from your dwelling place, and forgive their sins by which they have sinned against you and all the transgressions they have committed against you, and show them pity before their captors.” Instructed in this, Daniel faced Jerusalem in praying.
[AD 100] Didache on Daniel 6:10