1 Samuel 17:34-36

But David said to Saul, “Your servant has been tending his father’s sheep. When a lion or a bear came and carried off a lamb out of the flock, I went out after it, struck it down, and rescued the lamb out of its mouth. If it rose up against me, I grabbed him by its fur, struck it and killed it. Your servant has killed both the lion and the bear, so this uncircumcised Philistine will become like one of them—since he has defied the ranks of the living God.”