Lk 2:41-51
Every year the parents of Jesus used to go to Jerusalem for the feast of the Passover. When he was twelve years old, they went up for the feast as usual. When the days of the feast were over and they set off home, the boy Jesus stayed behind in Jerusalem without his parents knowing it. They assumed he was somewhere in the party, and it was only after a day’s journey that they went to look for him among their relations and acquaintances. When they failed to find him they went back to Jerusalem looking for him everywhere. It happened that, three days later, they found him in the Temple, sitting among the teachers, listening to them, and asking them questions; and all those who heard him were astounded at his intelligence and his replies.