kjv Luke:2:41-43
kjv@Luke:2:41 @ Now his parents went to Jerusalem every year at the feast of the passover.
kjv@Luke:2:42 @ And when he was twelve years old, they went up to Jerusalem after the custom of the feast.
kjv@Luke:2:43 @ And 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.