Leviticus 7:31
The priest is to burn the fat on the altar, but the breast belongs to Aaron and his sons.

Leviticus 7:34
I have taken from the sons of Israel the breast of the wave offering and the thigh of the contribution of their peace offerings, and I have given them to Aaron the priest and his sons as a permanent portion from the sons of Israel.'"

1 Samuel 9:24
So the cook picked up the leg and what was attached to it and set it before Saul. Then Samuel said, "Here is what was kept back. It was set apart for you. Eat, for it has been kept for you for this occasion, from the time I said, 'I have invited the people.' So Saul dined with Samuel that day.