If you are refering to cain from The Bible then the reason he killed 1/4 of the worlds population is because according to the bible, when cain killed his brother able there were only a total of 4 people on earth ( adam,eve, cain, and able) so one person WAS 1/4 of the whole population
Cain
Khmer rouge slaughtered one quarter of the worlds population in one blow
In the Bible, Cain killed his brother Abel.
In the Bible, Abel was killed by his brother Cain. The consequences of this act were that Cain was cursed by God and became a wanderer on the earth, unable to settle down and cultivate the land.
In the biblical story of Cain and Abel, Abel was killed by his brother Cain.
Abel was Cain's brother, that he killed.
According to the biblical account, Adam and Eve's sons, Cain and Abel, contributed to the population of the world by being the first two children born to them. Cain became a farmer and Abel became a shepherd. Cain later killed Abel out of jealousy, but Cain was then exiled and went on to have descendants who contributed to the growth of the human population.
I think you are referring to Cain. The story goes that Cain killed his brother out of jealously. When God found out he punished Cain by making any harm done onto Cain by others would come back on to them seven fold. This caused Cain to become a Vagabond and walk the earth until the Final Judgment.
Cain and Abel were Adam and Eve's sons. Cain killed Abel out of jealousy of his generosity.
Cain killed his brother Abel in the Bible.
When sin came to this earth, Adam and Eve had seen the green in earth withered, the animals turn against the humans and to see their son killed the other son.
He was killed by Cain.