New Defender's Study Bible Notes
4:2 Abel. “Abel” means “vapor” or “vanity.” By the time Abel was born, Eve was fully aware of the effect of God’s curse on the creation, which was made “subject to vanity” (Romans 8:20).
4:2 tiller of the ground. Both Cain and Abel had honorable occupations, Cain producing food for the family and Abel sheep for clothing and sacrifice. As time would pass and populations would multiply, such specializations could provide the basis for trade and optimum implementation of the Edenic mandate.