Musar su Deuteronomio 23:15

וישלחו מן המחנה . What is meant is that והיה מחניך קדוש, the impure, should be sent from all three camps, as the situation required, in order to comply with the Torah's instructions in Deut. 23,15, והיה מחניך קדוש, "your camp shall remain holy." The Zohar there explains that the reference is to the 248 limbs of a person which make up his skeleton and which must retain their sanctity. This is hinted at in our paragraph. There are three camps and they represent respectively the head, the heart, and the stomach. The head is the seat of the brain and of all thoughts, and this domain must not be polluted by even the most minor degree of impurity. Our sages have already taught us that the הרהורי עבירה, impure thoughts and intentions, are more dangerous morally than the actual impurity caused by committing the sin (Yuma 29a). There follows the camp of the Levites, which is comparable to the heart of man. Obviously a good and pure heart is to be maintained at all times. The third camp is comparable to man's stomach and intestines, an area vital for converting food into energy, and discharge of that which cannot be used constructively. This area is somewhat ugly; it reminds us constantly of the bodily aspects of man and our tragic inability to remain alive without the body. Nonetheless, anyone who suffers from severe types of impurity must leave even that part of the camp. The moral lesson of all this is to sanctify oneself by means of one's food intake or abstention from it. The Jew is commanded to observe modesty even when he performs biological functions that are necessary, such as excretions of undigested food. All of these rules are designed to expel serious impurities.

Among the [negative commandments] that are dependent on the (heart) [tongue] are: “Since the Lord, your God, moves about in your camp to protect you and to deliver your enemies to you, let your camp be holy; let not anything unseemly be seen among you” (Deuteronomy 23:15). They, may their memory be blessed, said (Berakhot 25b) that included in this [prohibition] is that when we speak words of the Torah of God, may He be blessed - and in our speaking in prayer in front of Him - our camp should be holy, and let not anything unseemly be seen among us. Therefore we were commanded about this, to mention [God’s] name in holiness and to engage in words of Torah and prayer in holiness; and not to mention [God’s] name or words of Torah if he is naked or if there is a naked man across from him. And likewise were we warned that the place be clean, as it is stated (Deuteronomy 23:14), “you shall dig a hole with it and cover up your excrement.” And all the more so is he warned not to mention [God’s] name if his hands are not clean. And if his hands touched something disgusting to him, he should wash them - like the matter that is stated (Psalms 26:6), “I wash my palms in cleanliness.” And when one is walking on the path and he is in doubt if the path is clean, he should not mention [God’s] name, and he should not say words of Torah. And if there is something that is not clean behind him - such as excrement or a carcass or water [used for] soaking [flax] - one must move a distance of four ells away from where the odor ends; but in front of him, [the distance] is [as far as] his eye can see. And carefulness about this is one of the ways of fearing God, as it is stated (Malachi 3:16), “concerning those who revere the Lord and esteem His name.” And our Rabbis, may their memory be blessed, said (Berakhot 24b), “‘For he has shown contempt for the word of the Lord’ (Numbers 15:31) - this is [referring to] one who says words of Torah in filthy alleyways.” And our Rabbis, may their memory be blessed, said (Kohelet Rabbah 1:17), “‘He gives wisdom to the wise’ (Daniel 2:21) because the wise honor the Torah and occupy themselves with it in holiness.” But if He had given it to the silly, they would have said words of Torah in filthy alleyways.

Furthermore, regarding the matter of lewdness of the mouth and the ear, namely, speaking words of lewdness or listening to them, our sages already "screamed like cranes" saying (on the verse): "'there shall not be any indecent (Erva) thing among you' (Devarim 23:15) - this refers to lewdness of speech" (Yerushalmi Teruma 1:6).