John 7:15-16

7:15 Then the Jewish leaders were astonished and said, “How does this man know so much when he has never had formal instruction?” 7:16 So Jesus replied, “My teaching is not from me, but from the one who sent me.

Acts 4:13

4:13 When they saw the boldness of Peter and John, and discovered that they were uneducated and ordinary men, they were amazed and recognized these men had been with Jesus.