The Bible

 

Leviticus 3:2

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2 And he is to put his hand on the head of his offering and put it to death at the door of the Tent of meeting; and Aaron's sons, the priests, are to put some of the blood on and round the altar.

The Bible

 

Exodus 27:21

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21 Let Aaron and his sons put this in order, evening and morning, before the Lord, inside the Tent of meeting, outside the veil which is before the ark; this is to be an order for ever, from generation to generation, to be kept by the children of Israel.