1 Samuel 2:15-17

2:15 Even before they burned the fat, the priest’s attendant would come and say to the person who was making the sacrifice, “Hand over some meat for the priest to roast! He won’t take boiled meat from you, but only raw.” 2:16 If the individual said to him, “First let the fat be burned away, and then take for yourself whatever you wish,” he would say, “No! Hand it over right now! If you don’t, I will take it forcibly!”

2:17 The sin of these young men was very great in the Lord’s sight, for they treated the Lord’s offering with contempt.

1 Samuel 2:29

2:29 Why are you scorning my sacrifice and my offering that I commanded for my dwelling place? You have honored your sons more than you have me by having made yourselves fat from the best parts of all the offerings of my people Israel.’