בְּזֵעַ֤ת אַפֶּ֙יךָ֙ תֹּ֣אכַל לֶ֔חֶם עַ֤ד שֽׁוּבְךָ֙ אֶל־הָ֣אֲדָמָ֔ה כִּ֥י מִמֶּ֖נָּה לֻקָּ֑חְתָּ כִּֽי־עָפָ֣ר אַ֔תָּה וְאֶל־עָפָ֖ר תָּשֽׁוּב׃
Sa pawis ng iyong mukha ka kakain ng tinapay, hanggang sa ikaw ay bumalik sa lupa, sapagkat mula roon ka kinuha; sapagkat alabok ka, at sa alabok ka babalik.
Rashi
בזעת אפיך IN THE SWEAT OF THY FACE — after you have taken all this great trouble.
Chizkuni
בזיעת אפיך, “in the sweat of your face; etc.;” the word אף in this verse refers to the protrusion called “nose,” which is the first organ beginning to perspire when one engages in physically strenuous activity. This particular curse affects only farmers, people working the soil. The second curse, that of enduring pain and hardship during the process of giving birth, affects only women. This was because Chavah had not only sinned but had also caused others, i.e. her husband, to sin. As a result she had been cursed more severely.
Da'at Zekenim
בזעת אפך, by the sweat of your brow;” Rabbi Yehudah hachassid draws our attention to the fact that this curse is one that affects only farmers who physically till the earth, but not people of a different vocation, especially the socially higher ranking people. The curse decreed for women concerning the pains endured during pregnancy and giving birth however, afflicts high ranking women no less than the lowliest servant maid. He attributes the distinction to the fact that the woman not only sinned but also seduced man to sin.