Daniel 9

Daniel 9:21

Let them read that Daniel says, "And behold, the man Gabriel." But why do we delay to shut up their mouths with another most evident and weighty proof, where no angel is mentioned individually or humankind in the plural, but rather the angels in their entirety are mentioned, namely, when it is said that through the angels not just any old word was spoken, but the law itself was given? Certainly, none of the faithful doubts that God gave Moses the law so that the people of Israel might be made subject to it, but nonetheless the law was given through angels. Thus Stephen says, "You received the law proclaimed by angels, and yet you do not keep it." What is more evident than this? What is stronger and with such authority? The law was given to that people in the proclamations of the angels, but the coming of our Lord Jesus Christ was arranged and foretold through the law. Christ himself, the Word of God, was in a marvelous and indescribable manner in the angels, in whose proclamation the law was given. Thus he says in the Gospel, "If you believed Moses, you would believe me also, for he wrote about me." Therefore, the Lord was speaking then through the angels; through the angels the Son of God, the one who would be the mediator between God and humankind, arranged his coming from the seed of Abraham so that he could find those who would receive him and confess themselves guilty, inasmuch as their failure to keep the law had made them transgressors. — ON THE TRINITY 3:10