Exodus 25:21-23

American Standard Version

²¹ And thou shalt put the mercy-seat above upon the ark; and in the ark thou shalt put the testimony that I shall give thee. ²² And there I will meet with thee, and I will commune with thee from above the mercy-seat, from between the two cherubim which are upon the ark of the testimony, of all things which I will give thee in commandment unto the children of Israel.

²³ And thou shalt make a table of acacia wood: two cubits shall be the length thereof, and a cubit the breadth thereof, and a cubit and a half the height thereof.