Hasidut untuk Keluaran 26:18

"And make planks etc twenty planks for the south, south side" (Ex. 26:18) - the explanation is that when a person does a mitzvah, they need to do it in two aspects which are one: to do it as established and according to the Jewish Law and two: to make sure that they will do it well and not sin, that is, there should be no emptiness and no sin, God forbid. The [category] mizvah is called by the expression "ten", as explained before, and so "twenty planks you shall make" meaning, that the mitzvah should be done in two times ten, that is "to the side of the south, south", meaning, Negev is the expression for neged, meaning, that you should guard yourself from the side of Negev Teimanah, that is from what is the opposition of Teiman, as Teiman is a hint to wisdom, and you should guard yourself from all emptiness that is an opposition to the mitzvah and make sure that you are doing it in its absolute completeness. And this is easy to understand.