15 Samuel also said to Saul, “The Lord sent me to anoint you king over His people, over Israel. Now therefore, heed the voice of the words of the Lord. 2 Thus says the Lord of hosts: ‘I will punish Amalek for what he did to Israel, how he ambushed him on the way when he came up from Egypt. 3 Now go and attack[a] Amalek, and utterly destroy all that they have, and do not spare them. But kill both man and woman, infant and nursing child, ox and sheep, camel and donkey.’ ”
It is important to understand that Samuel was a human being just like you and I. He had his own limited viewpoint of God and his own biases. Yes: Some of his instructions were from God. But some simply originated in himself, even though he may have believed they were coming from God - just like we see in "Men of God" today. And it is possible for true believers to sometimes fall into the temptation of believing a doctrine of demons and claiming it to be a teaching or an instruction from the Eternal Paradise Father. We are duty bound to immerse ourselves in the study of, "The Nature of God".