Exodus 25:12-16

And thou shalt cast four rings of gold for it, and put them in the four corners thereof; and two rings shall be in the one side of it, and two rings in the other side of it.

And thou shalt make staves of shittim wood, and overlay them with gold.

And thou shalt put the staves into the rings by the sides of the ark, that the ark may be borne with them.

The staves shall be in the rings of the ark: they shall not be taken from it.

And thou shalt put into the ark the testimony which I shall give thee.