Exodus 37:6 in the King James Version
And he made the mercy seat of pure gold: two cubits and a half was the length thereof, and one cubit and a half the breadth thereof.
Context
5 He put the poles into the rings on the sides of the ark, to bear the ark.
6 He made a mercy seat of pure gold. Its length was two and a half cubits, and a cubit and a half its width.
7 He made two cherubim of gold. He made them of beaten work, at the two ends of the mercy seat: