Luke 2:41-45

And his parents went every year to Jerusalem at the feast of the passover. And when he was twelve years old, they went up after the custom of the feast; and when they had fulfilled the days, as they were returning, the boy Jesus tarried behind in Jerusalem; and his parents knew it not; but supposing him to be in the company, they went a day’s journey; and they sought for him among their kinsfolk and acquaintance: and when they found him not, they returned to Jerusalem, seeking for him.