וַיֹּ֣אמֶר מֹשֶׁ֣ה אֶֽל־אַהֲרֹ֡ן וּלְאֶלְעָזָר֩ וּלְאִֽיתָמָ֨ר ׀ בָּנָ֜יו רָֽאשֵׁיכֶ֥ם אַל־תִּפְרָ֣עוּ ׀ וּבִגְדֵיכֶ֤ם לֹֽא־תִפְרֹ֙מוּ֙ וְלֹ֣א תָמֻ֔תוּ וְעַ֥ל כָּל־הָעֵדָ֖ה יִקְצֹ֑ף וַאֲחֵיכֶם֙ כָּל־בֵּ֣ית יִשְׂרָאֵ֔ל יִבְכּוּ֙ אֶת־הַשְּׂרֵפָ֔ה אֲשֶׁ֖ר שָׂרַ֥ף יְהוָֽה׃
And Moses said unto Aaron, and unto Eleazar and unto Ithamar, his sons: ‘Let not the hair of your heads go loose, neither rend your clothes, that ye die not, and that He be not wroth with all the congregation; but let your brethren, the whole house of Israel, bewail the burning which the LORD hath kindled.
Shenei Luchot HaBerit
ובגדיכם לא תפרומו . The reason that the priests must not rend their garments (10,6) is connected with their function as a sign of honor and dignity. We can apply the treatment to be accorded to these garments to the treatment we must accord to our bodies. The body is the garment of the soul. How much more insulting would it be to the soul if our body, its showpiece, would be torn, i.e. would bear signs of the sins we have committed!