Luke explains that many have written about the events concerning Jesus, and that after investigating everything from the beginning he is writing an orderly account for Theophilus, so that he may know the certainty of what he was taught. Luke then introduces the priest Zechariah and his wife Elizabeth, both righteous, old and childless. While Zechariah is burning incense in the temple, the angel Gabriel announces that Elizabeth will bear John the Baptist, who will be filled with the Holy Spirit from his mother's womb and will prepare the people for the Lord in the spirit and power of Elijah. Zechariah doubts, and is struck silent until the promise comes true.
In Elizabeth's sixth month, Gabriel visits Mary, a young woman of Nazareth engaged to Joseph, of David's house. He tells her she will conceive and bear Jesus, who will reign forever on David's throne. Mary asks how this can be, and the angel answers that the Holy Spirit will come upon her. Mary accepts as the Lord's servant. She then goes to visit Elizabeth in the hill country of Judea; the baby leaps in Elizabeth's womb, Elizabeth blesses Mary, and Mary answers with the Magnificat, a song celebrating God's mercy to the humble.
John is born. The neighbors want to name him after his father, but Elizabeth and Zechariah insist on John. Zechariah's speech returns, he is filled with the Holy Spirit and prophesies in the Benedictus, praising God for visiting and redeeming his people and announcing that John will go before the Lord. The child grows and lives in desert places until his public appearance to Israel.