Luke 2:42-45 English Revised Version (ERV)

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

43. and when they had fulfilled the days, as they were returning, the boy Jesus tarried behind in Jerusalem; and his parents knew it not;

44. but supposing him to be in the company, they went a day's journey; and they sought for him among their kinsfolk and acquaintance:

45. and when they found him not, they returned to Jerusalem, seeking for him.

Luke 2