Charles Spurgeon Commentary 1 Samuel 9:22-24

"And Samuel took Saul and his servant, and brought them into the guest-chamber, and made them sit in the chiefest place among them that were bidden, who were about thirty persons. And Samuel said unto the cook, Bring the portion which I gave thee, of which I said unto thee, Set it by thee. And the cook took up the thigh, and that which was upon it, and set it before Saul. And [Samuel] said, Behold, that which hath been reserved! set it before thee and eat; because unto the appointed time hath it been kept for thee, for I said, I have invited the people. So Saul did eat with Samuel that day." — 1 Samuel 9:22-24 (ASV)

And Samuel took Saul and his servant, and brought them into the parlour, and made them sit in the chiefest place among them that were bidden, which were about thirty persons. And Samuel said unto the cook, Bring the portion which I gave thee, of which I said unto thee, Set it by thee. And the cook took up the shoulder, and that which was upon it, and set it before Saul.

The right shoulder of the animal that was offered in sacrifice was part of the priest's portion, and this shoulder Samuel now ordered the cook to set before Saul as he sat in the place of honour.