בְּזֵעַ֤ת אַפֶּ֙יךָ֙ תֹּ֣אכַל לֶ֔חֶם עַ֤ד שֽׁוּבְךָ֙ אֶל־הָ֣אֲדָמָ֔ה כִּ֥י מִמֶּ֖נָּה לֻקָּ֑חְתָּ כִּֽי־עָפָ֣ר אַ֔תָּה וְאֶל־עָפָ֖ר תָּשֽׁוּב׃
你必汗流滿面才能吃到糧食，直到你歸回土地，因為你是從土地中被取出來的；你本是塵土，仍要歸於塵土。」
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.