Thematic Bible: Guilt of unauthorized persons offering

therefore I said, 'Now the Philistines will come down against me at Gilgal, and I have not asked the favor of the LORD.' So I forced myself and offered the burnt offering." Samuel said to Saul, "You have acted foolishly; you have not kept the commandment of the LORD your God, which He commanded you, for now the LORD would have established your kingdom over Israel forever.