1 Samuel 14:32-33

14:32 So the army rushed greedily on the plunder, confiscating sheep, cattle, and calves. They slaughtered them right on the ground, and the army ate them blood and all.

14:33 Now it was reported to Saul, “Look, the army is sinning against the Lord by eating even the blood.” He said, “All of you have broken the covenant! Roll a large stone over here to me.”