‏ Exodus 30:6

6“You are to place the altar in front of the veil by the ark 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 – 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 that is over the testimony – where I will meet with you.
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