1 Samuel 17:26-27

26David asked the men who were standing near him, ‘If someone kills this Philistine soldier and takes away the shame from Israel, what gift will he get? He is an unclean Philistine! He must stop insulting the army of our God, who lives for ever.’

27The men then told David what the king had promised to do. They said, ‘This is what the king will do to help the man who kills that Philistine soldier.’