Genesis 4:2

“And Abel was a keeper of sheep.” Whether both the brothers had married wives, and each had a separate home, Moses does not relate. This, therefore, remains to us an uncertainty, although it is probable that Cain was married before he slew his brother; since Moses soon after adds, that he knew his wife, and begat children: and no mention is there made of his marriage. Both followed a kind of life in itself holy and laudable. For the cultivation of the earth was commanded by God; and the labour of feeding sheep was not less honourable than useful; in short, the whole of rustic life was innocent and simple, and most of all accommodated to the true order of nature. This, therefore, is to be maintained in the first place, that both exercised themselves in labour approved by God, and necessary to the common use of human life.