And I heard a man's voice between the banks of Ulai, which called, and said,
Gabriel, make this man to understand the vision.
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Aquinas Study Bible
St. Augustine said "Christ is understood to have given this command to Gabriel." Ephrem the Syrian said Daniel's "guardian angel, who never parted from him, asked Gabriel." And St. Jerome said "the Jews claim that this man who directed Gabriel to explain the vision to Daniel was Michael himself.
The Jews claim that this man who directed Gabriel to explain the vision to Daniel was Michael [himself]. Quite appropriately it was Gabriel, who has been put in charge of battles, to whom this duty was assigned, inasmuch as the vision had to do with battles and contests between kings and even between kingdoms themselves. For Gabriel is translated into our language as "the strength of, or the mighty one of, God." And so at that time also when the Lord was about to be born and to declare war against the demons and to triumph over the world, Gabriel came to Zacharias and to Mary (Luke 1). And then we read in the Psalms concerning the Lord in His triumph: "Who is this king of glory? The Lord strong and mighty, the Lord mighty in battle; He is the King of glory" (Ps. 23:8=24:8). [The point of this quotation seems to be that the Hebrew word for "mighty" is gibbowr, from the root of which comes the gabri- of Gabriel.] But whenever it is medicine or healing that is needed, it is Raphael who is...