1 Samuel 17:8-9

8Then he stood and shouted out to the ranks of Israel saying to them, “Why come out to line up in battle array? Am I not the Philistine and aren’t you Saul’s servants? Choose for yourselves a man and let him come down to me.

9If he is able to fight with me and kill me, then will we become your slaves; but if I prevail against him and kill him, then will you become our slaves and serve us.”