Exodus 36:29 in the King James Version
And they were coupled beneath, and coupled together at the head thereof, to one ring: thus he did to both of them in both the corners.
Context
28 He made two boards for the corners of the tabernacle in the far part.
29 They were double beneath, and in the same way they were all the way to its top to one ring. He did this to both of them in the two corners.
30 There were eight boards and their sockets of silver, sixteen sockets—under every board two sockets.