Luke 2:43-45

New Revised Standard Version, Anglicised Catholic Edition

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. ⁴⁵ When they did not find him, they returned to Jerusalem to search for him.