1 Samuel 18:7-9

As they played, they sang, “Saul has killed thousands of his enemies, but David has killed tens of thousands.” The women’s song upset Saul, and he became very angry. He thought, “The women say David has killed tens of thousands, but they say I have killed only thousands. The only thing left for him to have is the kingdom!” So Saul watched David closely from then on, because he was jealous.