Exodus 26:28

Overview - Exodus 26
1	The ten curtains of the tabernacle.
7	The eleven curtains of goats' hair, and the covering of rams' and badgers' skins.
15	The boards of the tabernacle, with their sockets and bars.
31	The vail for the ark.
36	The hanging for the door.

Exodus 26:28  (King James Version)
And the middle bar in the midst of the boards shall reach from end to end.