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. They were overcome when they saw him, and his mother said to him, 'My child, why have you done this to us? See how worried your father and I have been, looking for you.' He replied, 'Why were you looking for me? Did you not know that I must be in my Father's house?'

(Lk 2:46-49)