Luke 2:12

On the eastern side of the town of Bethlehem, say St. Justin, St. Jerome, &c. there was a cave cut in the side of a rock, in which was a manger used by the people of those environs; so that these shepherds easily understood the angel, who told them they should find him laid in a manger. Sts. Jerome, Gregory of Nazianzus, Cyril, say that they found the child between an ox and an ass, according to the version of the Septuagint. Habacuc iii. 2.: You shall find him laid between two beasts. In the place where this crib was, St. Helen built a magnificent church in honour of the blessed Virgin Mary. Ven. Bede says that she built another in honour of the tree shepherds; whence St. Bernard concludes, that there were only three shepherds that came to adore the divine infant in the manger. (Tirinus) --- It might be necessary to give them notice of this humble appearance of the Messias, to encourage them to go and pay him their homage. (Barradius)