Exodus 25:17-19

"You are to make a cover for the ark out of pure gold; it is to be three-and-three-quarters feet long and two-and-a-quarter feet high.

You are to make two k'ruvim of gold. Make them of hammered work for the two ends of the ark-cover.

Make one keruv for one end and one keruv for the other end; make the k'ruvim of one piece with the ark-cover at its two ends.