Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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Leviticus 16:2

and Yahweh said to Moses, “Tell Aaron your brother not to come at just any time into the Most Holy Place within the veil, before the mercy seat which is on the ark; lest he die; for I will appear in the cloud on the mercy seat.

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