Exodus 26:12
As for the flap that is left over from the tent curtains, the leftover half curtain is to hang down over the back of the tabernacle.
Treasury of Scripture Knowledge
Summary
And the remnant that remaineth of the curtains of the tent, the half curtain that remaineth, shall hang over the backside of the tabernacle.
Shall hang over
Bible References
Shall hang over
Exodus 26:9
Join five of the curtains by themselves, and the other six curtains by themselves. Then fold the sixth curtain double at the front of the tent.