Exodus 26:22-25

22For the 1rear of the tabernacle, to the west, you shall make six boards. 23You shall make two boards for the corners of the tabernacle at the 2rear. 24They shall be double beneath, and together they shall be complete 3to its top 4to the first ring; thus it shall be with both of them: they shall form the two corners. 25There shall be eight boards with their 5sockets of silver, sixteen 6sockets; two 7sockets under one board and two 8sockets under another board.