Genesis 4:2
"And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground."
Cross References (ranked by relevance)
From the blood of Abel unto the blood of Zacharias, which perished between the altar and the temple: verily I say unto you, It shall be required of this generation.
And Pharaoh said unto his brethren, What is your occupation? And they said unto Pharaoh, Thy servants are shepherds, both we, and also our fathers.
Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
Now Moses kept the flock of Jethro his father in law, the priest of Midian: and he led the flock to the backside of the desert, and came to the mountain of God, even to Horeb.
And Noah began to be an husbandman, and he planted a vineyard:
And Israel said unto Joseph, Do not thy brethren feed the flock in Shechem? come, and I will send thee unto them. And he said to him, Here am I.
And the LORD took me as I followed the flock, and the LORD said unto me, Go, prophesy unto my people Israel.
Therefore the LORD God sent him forth from the garden of Eden, to till the ground from whence he was taken.
Lo, children are an heritage of the LORD: and the fruit of the womb is his reward.