6 As they returned home, after David had killed the Philistine, the women poured out of all the villages of Israel singing and dancing, welcoming King Saul with tambourines, festive songs, and lutes. 7 In playful frolic the women sang, Saul kills by the thousand, David by the ten thousand! 8 This made Saul angry - very angry. He took it as a personal insult. He said, "They credit David with 'ten thousands' and me with only 'thousands.' Before you know it they'll be giving him the kingdom!" 9 From that moment on, Saul kept his eye on David.
Matthew Henry's Commentary on 1 Samuel 18:6-9
Commentary on 1 Samuel 18:6-11
(Read 1 Samuel 18:6-11)
David's troubles not only immediately follow his triumphs, but arise from them; such is the vanity of that which seems greatest in this world. It is a sign that the Spirit of God is departed from men, if, like Saul, they are peevish, envious, suspicious, and ill-natured. Compare David, with his harp in his hand, aiming to serve Saul, and Saul, with his javelin in his hand, aiming to slay David; and observe the sweetness and usefulness of God's persecuted people, and the barbarity of their persecutors. But David's safety must be ascribed to God's providence.