Luke 2:42-44

New Revised Standard Version, Anglicised

⁴² And when he was twelve years old, they went up as usual for the festival. ⁴³ When the festival was ended and they started to return, the boy Jesus stayed behind in Jerusalem, but his parents did not know it. ⁴⁴ Assuming that he was in the group of travellers, they went a day’s journey. Then they started to look for him among their relatives and friends.