Numbers 18:12, 17

“I also give you the harvest gifts brought by the people as offerings to the LORD—the best of the olive oil, new wine, and grain.

“However, you may not redeem the firstborn of cattle, sheep, or goats. They are holy and have been set apart for the LORD. Sprinkle their blood on the altar, and burn their fat as a special gift, a pleasing aroma to the LORD.