St Gabriel is also the angel who announced to Zacharias the priest that his sterile wife will give birth to a son who will be called John (Luke 1:13). He mentioned some prophecies about that son, which shows that angels are capable of knowing what will happen in the future as revealed to them by God. Gabriel is also the one who was sent to the Holy Virgin and said to her, "The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore also, that Holy One who is to be born will be called the Son of God" (Luke 1:35).
Gabriel also clarifies visions when ordered by God. This appears in the vision of the prophet Daniel. When Daniel was perplexed with the vision, the Lord sent Gabriel to clarify the meaning of the vision to Daniel. (Dan. 8:16) In the subsequent chapter, the angel said, “O Daniel, I now come forth to give you skill and understanding.” (Dan.9: 22)
Tahisas 19 (December 27) is dedicated to commemorate the deliverance of the three youths (Sidraq, Misaq and Abdenago) from the burning fire of Nebuchadnezzar through the help of St Gabriel (Daniel 3).