In the Bible, in Genesis, it says that after Cain killed Abel, Cain was punished by God to wander on the earth and Cain was afraid that everyone would know that he had killed his brother and they would seek to kill him: “You have driven me this day from the face of the ground; and from Your face I will be hidden, and I will be a vagrant and a wanderer on the earth, and whoever finds me will kill me.” My question is who are the people that could kill Cain, for except the children born from Eve, no one is mentioned in the Bible.
After He created the first man and the first woman …
God blessed them; and God said to them, “Be fruitful and multiply, and fill the earth, and subdue it; and rule over the fish of the sea and over the birds of the sky and over every living thing that moves on the earth.” (Genesis 1:28)(NASB)
Cain knew this commandment of God and that people would multiply and spread on earth.
Thus, Cain was to see a steady growth in population and he would expect to be punished by his own relatives (siblings, grandchildren, great grandchildren, etc.) for the crime committed against Abel, but this did not happen. Moreover, Cain’s wife was also from his relatives, but the Bible does not specify her name and the relationship they had.
Translated by Felicia Rotaru