Origen, 248 A.D.
Contra Celsum 1,51 (c. 250 AD)
Origen Adamantius, born in Alexandria in Egypt in 185, was a theologian, writer and catechist who wrote in Greek. He is considered to be one of the most important Christian theologians and scholars of the first three centuries. His family was almost certainly Greek and they provided for his education at the Catechetical School of Alexandria.
In the third decade of the third century, at the invitation of the Roman governor of Arabia who was interested in meeting him, Origen visited Palestine where he also preached. During this period he was able to observe the tradition of worship at the Holy Places and in particular at the Grotto of the Nativity.
Certain site of the birth of Jesus
If anyone, not being satisfied with the prophecy of Micah and the history recorded in the Gospels by the disciples of Jesus, desires additional evidence that Jesus was born in Bethlehem, let him consider the fact that in Bethlehem there is shown the cave where he was born, and in this cave there is the manger in which he was wrapped in swaddling clothes; and all of this is in conformity with the narrative in the Gospels regarding his birth. And it is well known in these places, even among those who are enemies to the faith, that in this cave was born he who is worshipped and regarded with wonder by Christians, Jesus.