Exodus 26:12

וסרח העדף ביריעת האהל AND THE SURPLUS OF THE CURTAINS OF THE TENT over and above the lower curtains of the Tabernacle [SHALL HANG OVER etc.]. “The curtains of the אהל” were the upper ones made of goats’ hair which Scripture calls אהל, as it states about them, (v. 7) “they shall be an אהל over the dwelling.” The word אהל used in connection with them means only a covering (the word has not its usual meaning of “tent“) because they formed a cover and a screen over the lower ones. They exceeded the lower ones by one half curtain on the west side. For the other half of the eleventh curtain which was in excess of the number of the lower ones was folded over to hang in front of the tent (the Tabernacle) (cf. v. 9). There therefore remained two cubits, — the breadth of the half of it — in excess of the width of the lower curtains (it is this which is here described as חצי היריעה העדפת “the half curtain that exceeded”). תסרח על אחרי המשכן SHALL HANG OVER THE BACK OF THE TABERNACLE — to cover the two cubits of the boards that were left bare. אחרי המשכן THE BACK OF THE TABERNACLE — i. e. the west side. This is called “the back” because the entrance was on the east side which was therefore its front. The north and the south are accordingly called the “sides” in the right and the left directions.

וְסֶ֙רַח֙ הָעֹדֵ֔ף בִּירִיעֹ֖ת הָאֹ֑הֶל חֲצִ֤י הַיְרִיעָה֙ הָעֹדֶ֔פֶת תִּסְרַ֕ח עַ֖ל אֲחֹרֵ֥י הַמִּשְׁכָּֽן׃

And the remnant that remains of the curtains of the tent, the half curtain that remains, shall hang over the back of the tabernacle.