‏ Numbers 18:17

17But you shall not redeem the firstborn
18:17 i. e. among. But μόσχος is used elsewhere in the LXX. for horned cattle old enough to breed.
of calves and the firstborn of sheep and the firstborn of goats; they are holy: and you shall pour their blood upon the altar, and you shall offer the fat as a burnt offering for a smell of sweet savor to the Lord.
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