Then why did Abel offer a sacrifice of a lamb and Cain offer up fruit and vegetables? Did Abel need more clothing? Really just asking a question. God did let them know about the sacrifice that was to come and I am sure explained why a lamb had to die even if He did use the skins as clothing that the lamb was used in atonement for their sins.... Verses explaining a sacrifice...or a way out for them...
Genesis 3:~
15And I will put enmity Between you and the woman, And between your seed and her seed; He shall bruise you on the head, And you shall bruise him on the heel."
God's way of telling them that satan would bruise Jesus heel, but that Jesus would wipe out satan....letting them know there was a way out of this sin through Jesus.
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[TD="class: answercell"]Following came from Christianity Stack Exchange Question area......
When Adam and Eve sinned in the garden, God gave them skins to cover up with (Genesis 3:21). To get those skins, some animal had to die. In other words, God sacrificed an animal to cover their sin[SUP]
1[/SUP]. From the beginning, God has declared the payment for sin is death, and so blood must be shed to cover sin:
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