1 Samuel 17:31

And when the words were heard which David spake, they rehearsed them before Saul: and he sent for him.

The words that were heard and repeated before Saul, so that he sent for David, were an expression of courage to face the Philistine champion. That courage came from faith in God rather than from trust in human strength. The stand of faith that those words expressed led to David's victory over Goliath. That victory was so widely and lastingly remembered that years later it caused the servants of Achish to recognize David. Their recognition placed him in danger while he was a fugitive.