1 Samuel 2:15-17

15Moreover, before the fat was burned, the priest's servant would come and say to the man who was sacrificing, "Give meat for the priest to roast, for he will not accept boiled meat from you but only raw."

16And if the man said to him, "Let them burn the fat first, and then take as much as you wish," he would say, "No, you must give it now, and if not, I will take it by force."

17Thus the sin of the young men was very great in the sight of the Lord, for the men treated the offering of the Lord with contempt.