Luke 2:41

39And when they had performed all things according to the law of the Lord, they returned into Galilee, to their own city Nazareth.

40And the child grew, and waxed strong in spirit, filled with wisdom: and the grace of God was upon him.

41Now his parents went to Jerusalem every year at the feast of the passover.

42And when he was twelve years old, they went up to Jerusalem after the custom of the feast.

43And when they had fulfilled the days, as they returned, the child Jesus tarried behind in Jerusalem; and Joseph and his mother knew not of it.