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In Luke and Acts

The Gospel of Luke adds an account of John's infancy, introducing him as the miraculous son of Zechariah, an old priest, and his wife Elizabeth, who was past menopause and therefore unable to have children. According to this account, the birth of John was foretold by the angel Gabriel to Zechariah while he was performing his functions as a priest in the temple of Jerusalem. Since he is described as a priest of the course of Abijah and Elizabeth as one of the daughters of Aaron, this would make John a descendant of Aaron on both his father's and mother's side. On the basis of this account, the Catholic as well as the Anglican and Lutheran liturgical calendars placed the feast of the Nativity of John the Baptist on 24 June, six months before Christmas.

Elizabeth is described as a "relative" of Mary the mother of Jesus, in Luke 1:36. There is no mention of a family relationship between John and Jesus in the other Gospels, and Raymond E. Brown has described it as "of dubious historicity ". Géza Vermes has called it "artificial and undoubtedly Luke's creation". The many similarities between the Gospel of Luke story of the birth of John and the Old Testament account of the birth of Samuel suggest that Luke's account of the annunciation and birth of Jesus are modeled on that of Samuel.