Luke 2:41-51

Now His parents went to Jerusalem every year at the Feast of the Passover. And when He became twelve, they went up there according to the custom of the Feast; and as they were returning, after spending the full number of days, the boy Jesus stayed behind in Jerusalem. But His parents were unaware of it, but supposed Him to be in the caravan, and went a day's journey; and they began looking for Him among their relatives and acquaintances.