They have taken some of the devoted things; These things were DEVOTED to destruction. This word is used in context of those people and things that were marked (devoted) for destruction. They were to be appointed for destruction. It was a very big deal to leave anything devoted to destruction alive. This continued to be a problem. Saul had not learned from these ancient examples and repeated the offence when he did not destroy everything as commanded by God through the prophet Samuel. "why is this bleating of the sheep in my ears" and then saving King Agag.
When God has decided that something is DEVOTED to destruction there must be a complete annhilation and no quarter given.
When the devil tells you that it is ok to tolerate a "little sin" in your life, or "it is not a sin" or "you surely shall not die" or "leave us, we are just weaknesses of the flesh, no one is perfect, it won't keep your out of heaven." Take up your spiritual sword of faith and hack it to death like Samuel did Agag. It is devoted to destruction, give it no quarter.
I think I just got my next sermon.