TSK · Exodus 29:22

Then he must present a gift to the LORD from the peace offering sacrifice: He must remove all the fatty tail up to the end of the spine, the fat covering the entrails, and all the fat on the entrails,

The right thigh you must give as a contribution offering to the priest from your peace offering sacrifices.

As for the fat parts from the ox and from the ram(the fatty tail, the fat covering the entrails, the kidneys, and the protruding lobe of the liver),

Also, the breast of the wave offering and the thigh of the contribution offering you must eat in a ceremonially clean place, you and your sons and daughters with you, for they have been given as your allotted portion and the allotted portion of your sons from the peace offering sacrifices of the Israelites.

So the cook picked up the leg and brought it and set it in front of Saul. Samuel said,“What was kept is now set before you! Eat, for it has been kept for you for this meeting time, from the time I said,‘I have invited the people.’” So Saul ate with Samuel that day.