1 Samuel 15:7-9

7Then Saul struck down the Amalekites all the way from Havilah to Shur, which is next to Egypt.

8He captured King Agag of the Amalekites alive, but he executed all Agag’s people with the sword.

9However, Saul and the army spared Agag, along with the best of the flock, the cattle, the fatlings, and the lambs, as well as everything else that was of value. They were not willing to slaughter them. But they did slaughter everything that was despised and worthless.