Leviticus 16:2

2The Lord said to Moses: “Tell your brother Aaron that he may not come whenever he wants into the holy place a behind the veil b in front of the
mercy seat: Or place of atonement; the gold lid on the ark of the covenant, first used in the tabernacle and later in the temple
mercy seat d on the ark or else he will die, because I appear in the cloud e above the mercy seat. f

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