Parallel
Numbers 18:17
Brenton's English Septuagint · Berean Standard Bible
But thou shalt not redeem the first-born of calves and the first-born of sheep and the first-born of goats; they are holy: and thou shalt pour their blood upon the altar, and thou shalt offer the fat as a burnt-offering for a smell of sweet savour to the Lord.
But you must not redeem the firstborn of an ox, a sheep, or a goat; they are holy. You are to splatter their blood on the altar and burn their fat as a food offering, a pleasing aroma to the LORD.