Then David said to Saul, "Let no man's heart fail because of him; your servant will go and fight with this Philistine."
1 Samuel 17:32
Surrounding context
17:31 Now when the words which David spoke were heard, they reported them to Saul; and he sent for him.
17:32 Then David said to Saul, "Let no man's heart fail because of him; your servant will go and fight with this Philistine."
17:33 And Saul said to David, "You are not able to go against this Philistine to fight with him; for you are a youth, and he a man of war from his youth."