The Amalekites: Saul: Condemned for not Utterly Destroying

Saul and his troops spared Agag, along with the best of the sheep and cattle, the fat calves and lambs, and the best of everything else. They were unwilling to devote them to destruction, but they devoted to destruction all that was despised and worthless. …

Because you did not obey the LORD or carry out His burning anger against Amalek, the LORD has done this to you today.