Likutei Moharan 59:6/ליקוטי מוהר"ן נ״ט:ו׳

16. And know! there are certain wicked people whom it is forbidden to bring under the wings of His service, since they cause the one who brings them closer to descend from his level. As we find concerning Moshe, that he attracted the mixed multitude and then later, as a result of this, the Holy One said to him: “Go down, for your people have become corrupt” (Exodus 32:7). There is not enough power in the aforementioned mishpat to subdue their evil. And when mishpat is lacking, this brings great harm to the angels made by mishpat, as explained above, as well as to the aforementioned circle and square. {Why are the Tarmodians’ eyes weak?… Because where they reside they are surrounded by cholot (sand) (Shabbat 31a).}

2This is the explanation of: Why are the Tarmodians’ eyes weak? “Tarmod” is the aspect of wicked people who are not accepted as converts. {As our Sages, of blessed memory, said: We do not accept converts from the Tarmodians (Yevamot 16a-b) .}

3Whoever brings them closer, their eyes become weak. This is the aspect of marring ShaBbaT— Shin is the three colors of the eye; BaT is the bat (pupil) of the eye (Tikkuney Zohar #70)—the aspect of marring the aforementioned wall and house, which are the aspect of the eyes.

4For the eyes connote wisdom, as it is written (Genesis 3:7), “Then the eyes of both of them were opened.” And of the soul it is said (Ecclesiastes 6:9), “Better is the feasting of the eyes than the soul’s pursuit.” And this is the aspect of the blemish of anger, the aspect of “My eyes are dimmed by anger” (Psalms 6:8). It is likewise the aspect of wealth, the aspect of “As prosperity increases, so do those that consume it. What, then, has its possessor gained other than feasting his eyes?” (Ecclesiastes 5:10) .

5Thus, they asked Hillel the Prince: Why are their eyes weak?—That is, [why are] all the aforementioned aspects of the eyes marred when those who are undeserving, such as the Tarmodians, are brought close?

6And Hillel answered: Because where they reside they are surrounded by cholot—In other words, the success of these wicked people is so dominant that the power of mishpat is incapable of subduing their evil. This is: “His ways yachilu (prosper) at all times; he is impervious to Your mishpat” (Psalms 10:5). Thus, this is the meaning of “surrounded by ChoLot,” the aspect of yaChiLu, the aspect of their success making them impervious to mishpat .

7That mishpat is required, is known, as explained above. But, because they are impervious to mishpat, the aspect of the eyes is marred.

8{Until here is leshon Rabbeinu z’l .139}

9{Lesson #58, “Tlat Nafkin Meichad (Three Emerge from One),” and this teaching, “Heikhal HaKodesh (A Chamber of Holiness),” were delivered as a single teaching on the verse, “Happy is the people that knows the shofar’s blast” (Psalms 89:16). However, afterwards, when [the Rebbe] recorded them, he separated them into two lessons. Thus, when he gave me the written texts of these teachings, he said, “I separated them into two.” I understood that he had a definite intention with this, one which God alone knows.}