Exodus 26:33-34

33You are to hang this curtain under the clasps and bring the ark of the testimony in there behind the curtain.
The traditional expression is “within the veil,” literally “into the house (or area) of the (special) curtain.”
The curtain will make a division for you between the Holy Place and the Most Holy Place.
Or “the Holy of Holies.”
34You are to put the atonement lid on the ark of the testimony in the Most Holy Place.
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