Exodus 27:21

21In the tent of meeting outside the veil that is in front of the
testimony: A reference to either the Mosaic law in general or to a specific section of the law, the Ten Commandments, which were written on stone tablets and placed in the ark of the covenant (also called the ark of the testimony)
testimony, b Aaron and his sons are to tend the lamp c from evening until morning before the Lord. This is to be a permanent statute d for the Israelites throughout their generations.
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