Here I am: witness against me before Yahweh, and before his anointed: whose ox have I taken? or whose donkey have I taken? or whom have I defrauded? whom have I oppressed? or of whose hand have I taken a ransom to blind my eyes therewith? and I will restore it you.
So you do remember that he started out his career extremely early. As soon as he was weaned he was a public figure. He was there in the place of worship. The people who would gather for worship saw this little boy year by year as he grew and as he developed. They recognized that God's hand was upon this young man. He just sort of naturally grew into the position of leadership and judge over Israel.