The earliest biblical descriptions, the Gospel of Matthew and the Gospel of Luke, written between A.D. 80 and 100, offer details of Jesus’ birth, including that he was born in Bethlehem during the reign of King Herod.
The Gospel of Luke says that when the shepherds went to Bethlehem, they “found Mary and Joseph, and the baby, who was lying in the manger.” Matthew tells the story of the three wise men, or Magi, who “fell down” in worship and offered gifts of gold, frankincense and myrrh.
But as my research on the relationship between the New Testament and the development of popular Christian traditions shows, the earliest biblical descriptions do not mention the presence of any animals. Animals first start to appear in religious texts around the seventh century.
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A series of early Christian stories that informed popular religious devotion, including what’s known as the Infancy Gospel of Matthew, attempted to fill in the gap between Christ’s infancy and the beginning of his public ministry. This text was the first to mention the presence of animals at Jesus’ birth. It described how the “most blessed Mary went forth out of the cave and entering a stable, placed the child in the stall, and the ox and the ass adored Him.”
This description, subsequently cited in several medieval Christian texts, created the Christmas story popular today.

