Amalek
In the first Book of Samuel, Chapter 15,  the Lord told Samuel to tell Saul to kill all Amalekites and destroy all of their property and kill all their animals because it was something that the Lord told the Israelites to do back in the time of Moses. But when Saul attacked Amalek, he captured King Agag instead of killing him and Saul and his warriors kept the best animals for themselves but “everything despised and worthless that they utterly destroyed” (1 Samuel 15:9).  So the Lord sent Samuel to King Saul to tell him “now the Lord sent you on a mission and said “go and utterly destroy the sinners, the Amalekites, and fight against them until they are exterminated. Why then did you not obey the voice of the Lord?”. (1 Samuel 15:18-19). When Saul said that he killed the Amalekites except for their king and was actually going to sacrifice their animals to the Lord, Samuel told him