1 Samuel 17:37

Saul said unto David, Go. The king's consent was necessary before David could act as the champion of the Israelites. It was a courageous act in Saul to give his permission, considering the conditions of the combat (see 1 Samuel 17:9 ), but the two arguments here given persuaded him: the first, David's strong confidence in Jehovah, insuring his courage; and, secondly, the coolness and bravery he had shown in these dangerous encounters with savage animals.