1 Samuel 14:32-33

32[When night came and the oath ended] the people rushed greedily upon the spoil. They took sheep, oxen, and calves, and slaughtered them on the ground; and they ate them [raw] with the blood [still in them].

33Then Saul was told, “Look, the people are sinning against the Lord by eating [the meat] with the blood.” And he said, “You have violated [the Law] and acted treacherously; roll a large stone to me today.”