http://www.biblegateway.com and
http://www.answersingenesis.org/home/area/tools/cains_wife.asp
Regarding Adam and Eve;
However, Adam and Eve did not have accumulated genetic mistakes. When the first two people were created, they were physically perfect. Everything God made was very good (
Genesis 1:31), so their genes were perfectno mistakes! But, when sin entered the world (because of Adam
Genesis 3:6ff,
Romans 5:12), God cursed the world so that the perfect creation then began to degenerate, that is, suffer death and decay (
Romans 8:22). Over thousands of years, this degeneration has produced all sorts of genetic mistakes in living things.
It wasn't until 400 years after Abraham that G-d gave Moses the laws that forbade it.
We know that Seth was born when Adam was 130 years old (
Genesis 5:3), and Eve saw him as a replacement for Abel (
Genesis 4:25). Therefore, the period from Cains birth to Abels death may have been 100 years or moreallowing plenty of time for other children of Adam and Eve to marry and have children and grandchildren. By the time Abel was killed, there could well have been a considerable number of descendants of Adam and Eve, involving several generations.
Cain married before he went to Nod, he 'knew' his wife, or lay with her in Nod. So to answer your question, Cains wife was his sister. As, if you so have this faith, we are all brothers and sisters. We know that Adam and Eve had children.
Cain was the first child of Adam and Eve recorded in Scripture (
Genesis 4:1). His brothers, Abel (
Genesis 4:2) and Seth (
Genesis 4:25), were part of the
first generation of children ever born on this Earth.
Even though only these three males are mentioned by name, Adam and Eve had other children. In
Genesis 5:4 a statement sums up the life of Adam and EveAnd the days of Adam after he had fathered Seth were eight hundred years. And he fathered sons and daughters. This does not say
when they were born. Many could have been born in the 130 years (
Genesis 5:3) before Seth was born.
During their lives, Adam and Eve had a number of male and female children. The Jewish historian Josephus wrote that, The number of Adams children, as says the old tradition, was thirty-three sons and twenty-three daughters.
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The Bible does not tell us how many children were born to Adam and Eve. However, considering their long life spans (Adam lived for 930 years
Genesis 5:5), it would seem reasonable to suggest there were many! Remember, they were commanded to Be fruitful, and multiply (
Genesis 1:28).
It's a faith thing, either you don't believe or you'll spend an eternity trying to disprove it. Oh and Cain didn't try to kill his brother, he did kill his brother. He killed him because G-d rejects his sacrifice but accepts Abel's. He is then cursed to wander with a mark upon him.
Now if I may, according to the Midrash, an Exegesis, an involved and critical interpertation of a scripture, it states that the real motive involved the desire of women. According to Midrashic tradition, Cain and Abel each had twin sisters, whom they were to marry. The Midrash say that Abel's promised wife was the more beautiful, and hence Cain desired to rid himself of Abel, whose presence was inconvenient. While the Torah merely states that Cain killed Abel, the Midrash records the tradition that the two brothers fought, until Abel, who was the stronger of the two, overcame Cain, but mercifully spared his life. Cain, however, took Abel unawares and, overpowering him, killed him. The exact method of murder varies with some traditions proposing a stone, others a cane, and others by strangling him.
The twins were their own sisters but not twins to each other. So, Cain was born with a twin and so was Abel. That is they were part of a set of twins and that Cain was to marry Abels twin and Abel was to marry Cains twin but was murdered. So he still married his sister either way.
