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Numbers 18:8

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8 And the Lord said to Aaron: Behold I have given thee the charge of my firstfruits. All things that are sanctified by the children of Israel, I have delivered to thee and to thy sons for the priestly office, by everlasting ordinances.

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Exodus 27:21

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21 In the tabernacle of the testimony without the veil that hangs before the testimony. And Aaron and his sons shall order it, that it may give light before the Lord until the morning. It shall be a perpetual observance throughout their successions among the children of Israel.