Exodus 30:6
6 And you shall put it in front of the sveil that is above the tark of the testimony, in front of uthe mercy seat that is above the testimony, vwhere I will meet with you.
Leviticus 16:2
2 and the Lord said to Moses, “Tell Aaron your brother not to come wat any time xinto the Holy Place inside the veil, before the mercy seat that is on the ark, so that he may not die. For I will yappear in the cloud zover the mercy seat.
Numbers 7:89
89 And when Moses went into the tent of meeting to speak with the Lord, he heard the voice speaking to him wfrom above the mercy seat that was on the ark of the testimony, from between the two cherubim; and it spoke to him.