When Jesus was 12 years old Joseph and Mary took him to Jerusalem for the Feast of the Passover. When they returned home he stayed behind but they didn’t notice at first because they thought he was somewhere among the group they have traveled with. It took them three days to discover he was gone and then return to Jerusalem to find him.
After three days they found him in the temple, sitting among the teachers, listening to them and asking them questions. And all who heard him were amazed at his understanding and his answers. (Luke 2:46,47)