Luke 2:48

45 and not having found him, they turned back to Jerusalem seeking him.

46 And it came to pass, after three days, they found him in the temple, sitting in the midst of the teachers, both hearing them and questioning them,

47 and all those hearing him were astonished at his understanding and answers.

48 And, having seen him, they were amazed, and his mother said unto him, `Child, why didst thou thus to us? lo, thy father and I, sorrowing, were seeking thee.`

49 And he said unto them, `Why [is it] that ye were seeking me? did ye not know that in the things of my Father it behoveth me to be?`

50 and they did not understand the saying that he spake to them,

51 and he went down with them, and came to Nazareth, and he was subject to them, and his mother was keeping all these sayings in her heart,