Wherefore, behold, I send unto you prophets, and wise men, and scribes: and some of them ye shall kill and crucify; and some of them shall ye scourge in your synagogues, and persecute them from city to city: That upon you may come all the righteous blood shed upon the earth, from the blood of righteous Abel unto the blood of Zacharias son of Barachias, whom ye slew between the temple and the altar. Matthew 23:34-35
That the blood of all the prophets, which was shed from the foundation of the world, may be required of this generation; 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. Luke 11:50-51
It would seem probable that Adam and Eve had shown love and instruction to both their sons. How each son made their choice and why, is a mystery. Cain rejected GOD's way and followed his own. Abel, as GOD's first prophet most certainly counseled his brother on the choice he had made. Finally one day as they were in a field, with Abel possibly urging repentance, Cain rose up against his brother and killed him. Abel was not only righteous and the first prophet but now he was the first martyr. He was the first ever to die. He was the first inhabitant in paradise. At this time the process of death and death's aftermath were both new experiences for everyone. What in the world did Adam, and his family, think on this dark day in their lives? Did Adam think about Eden and the mistakes he and Eve made there? His mistakes were now in a way passed on to his children. The promised death came to his son before it came to him. Was this a terrible surprise to him? Certainly it was.