1 Samuel 17:33-37

But Saul said to David, “You are not able to go against this Philistine to fight him; for you are only a youth, while he has been a warrior since his youth.”

But David said to Saul, “Your servant was tending his father’s sheep. When a lion or a bear came and took a sheep from the flock,

I went out after it and attacked it, and rescued the sheep from its mouth; and when it rose up against me, I grabbed it by its mane and struck it and killed it.

Your servant has killed both the lion and the bear; and this uncircumcised Philistine will be like one of them, since he has defied the armies of the living God.”

And David said, “The Lord who saved me from the paw of the lion and the paw of the bear, He will save me from the hand of this Philistine.” So Saul said to David, “Go, and may the Lord be with you.”