The angel Gabriel appeared to Joseph in a dream to tell him about Mary's pregnancy.
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If you are referring to Gabriel the Archangel, he did not have a human "life." He was created as a pure spirit by God long before the Universe existed. His "job" is to stand before the throne of God and is also a special messenger for him. He was entrusted by God to deliver important messages to persons on Earth. For example, it was Gabriel who announced to Mary that she had been chosen to be the Mother of Jesus.
It is believed to have been the Archangel Gabriel.
The appearance of the Angel Gabriel to Mary to tell her she had been chosen to be the mother of God is called the Annunciation.
Joseph was told that his fiancee was going to get pregnant with the power of the holy spirit. and to name him Jesus and that he would be the savior of the world.
Your question really needs to be a bit more specific. However, if you are referring to the Archangel Gabriel, he is an archangel and God's messenger to bring important messages to man. He is especially known for his appearances to the Blessed Virgin Mary and also to Saint Joseph.
"Now Tells Gentle Mary" is a traditional Christmas carol. The lyrics tell the story of the Annunciation, where the angel Gabriel informs Mary of her role in bearing Jesus. If you'd like a summary or analysis of its themes, I'd be happy to help!
The day is known as the Annunciation. It is a Christian feast day that commemorates the angel Gabriel's visit to the Virgin Mary to announce that she would conceive and give birth to Jesus, the Son of God.
Gabriel was the angel who came to Mary, mother of Jesus, and Zechariah, father of John the Baptist, to tell them that their sons were to be born and the significance of each birth. (See Luke 1 11-38.) Gabriel also appeared to Daniel in the Old Testament. Gabriel told Daniel the meaning of the vision relating to the last days of this world. (See Daniel 8 & 9.)
Gabriel visited Mary to tell her that she had been chosen to bear Jesus (Luke 1:26-38). The angel who announced the birth of Christ to the shepherds is not named (Luke2:8-15). Matthew's gospel doesn't name any of the angels involved in events surrounding Jesus' birth. Mark and John do not record these angelic visits.
Mary did not tell any one to write about Jesus.