Genesis 3:19

By the labour of thy hands thou shalt eat food, until thou turn again to the dust from which thou wast created: for dust thou art, and unto dust thou shalt return; for from the dust it is to be that thou art to arise, to render judgment and reckoning for all that thou hast done, in the day of the great judgment.

אל עפר תשוב, you will revert to dust, just as I had told you “on the day you eat from it you will surely become mortal.” (not that he would actually die on that same day).

בזעת אפיך תאכל לחם, if you prefer to eat bread to eating grass, herbs, you will have to toil in the sweat of your brow in order to produce cereal grain which can be turned into bread. Even though the whole body will perspire, not just the brow, the Torah mentions the face especially, seeing that this is where his perspiration will be most visible. Furthermore, a face does not begin to perspire until one has exerted oneself considerably. Man will have to be fatigued by a variety of strenuous activities before finally being able to consume bread. He has to plough, to sow , to remove weeds, to cut the grain, to thresh the kernels in their husks, to winnow, to grind the kernels into flour, to knead the dough and to bake it.

עד שובך אל האדמה, seeing that you have chosen to prefer your close connection to earth rather than that to the celestial regions in which your soul originated, כי עפר אתה ואל עפר תשוב, when you die, no part of your heavenly origin will remain behind on earth. The reason why the Torah emphasized the physical element earth rather than any of then other elements which are part of the human body, is that earth, including the bones which are cold and hard and man’s basic skeleton, and are the element predominates in the human body.

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.