בְּזֵעַ֤ת אַפֶּ֙יךָ֙ תֹּ֣אכַל לֶ֔חֶם עַ֤ד שֽׁוּבְךָ֙ אֶל־הָ֣אֲדָמָ֔ה כִּ֥י מִמֶּ֖נָּה לֻקָּ֑חְתָּ כִּֽי־עָפָ֣ר אַ֔תָּה וְאֶל־עָפָ֖ר תָּשֽׁוּב׃
מיט דעם שװײס פֿון דײַן פּנים זאָלסטו עסן ברױט, ביז דו קערסט זיך אום צו דער ערד; װײַל פֿון איר ביסטו גענומען געװאָרן; װאָרום שטױב ביסטו, און צו שטױב זאָסלטו זיך אומקערן.
Mishnah Nedarim
He who vows not to wear garments is permitted sack-cloth, curtain, and blanket wrapping. If he says, “Konam, if wool comes upon me,” he may cover himself with wool shearings; [Konam] if flax comes upon me”, he may cover himself with stalks of flax. Rabbi Judah says: It all depends upon the person who vows, [thus:] if he was bearing a burden [with wool or flax] and perspires and had bad odor, and he said “Konam if wool or flax come upon me,” he may wear them, but not throw them [as a bundle] over his back.