Exodus 26:18
There will be twenty boards for the southern side of the Holy Tent.
Each board shall have two arms that shall serve to fasten the boards in line; for all the frames of the Holy Tent, you must do this.
Planks You are to make frames of acacia wood for the Holy Tent, which will stand upright.
For the Holy Tent, you will make further coverings: one of the rams’ skins dyed red and another covering of fine leather, to spread over this.
You must make fifty bronze clasps and put them into one of the loops, drawing the two sets together to form one tent over the Holy Tent.
You must attach fifty loops to the border of the last sheet in one set and the same to the border of the previous sheet in the second set.
You must sew five of these sheets together into one sheet, the remaining six into another; the sixth you will fold double over the front of the cover.