Exodus 37:5 (KJV)

And he cast for it four rings of gold, to be set by the four corners of it; even two rings upon the one side of it, and two rings upon the other side of it.

And he made staves of shittim wood, and overlaid them with gold.

And he put the staves into the rings by the sides of the ark, to bear the ark.

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.

And he made two cherubims of gold, beaten out of one piece made he them, on the two ends of the mercy seat;