Charles Spurgeon Commentary 1 Samuel 2:13

"And the custom of the priests with the people was, that, when any man offered sacrifice, the priest`s servant came, while the flesh was boiling, with a flesh-hook of three teeth in his hand;" — 1 Samuel 2:13 (ASV)

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And the priests' custom with the people was, that, when any man offered sacrifice, the priest's servant came, while the flesh was in seething, with a fleshhook of three teeth in his hand; and he struck it into the pan, or kettle, or caldron, or pot; all that the fleshhook brought up the priest took for himself. So they did in Shiloh unto all the Israelites that came thither.

God had appointed a proper portion for his priests so that those who ministered at the altar might live from the altar. But these wicked men were not content with the divine allowance, so they inevitably robbed the altars of God and showed such greed as to make the appointed sacrifices detestable to the people.