Genesis 4:4 Abel, on his part also brought of the firstlings of his flock and of their fat portions. And the LORD had regard for Abel and for his offering;

Genesis 4:8 Cain told Abel his brother. And it came about when they were in the field, that Cain rose up against Abel his brother and killed him.

Matthew 23:35 so that upon you may fall the guilt of all the righteous blood shed on earth, from the blood of righteous Abel to the blood of Zechariah, the son of Berechiah, whom you murdered between the temple and the altar.

Hebrews 5:1 For every high priest taken from among men is appointed on behalf of men in things pertaining to God, in order to offer both gifts and sacrifices for sins;

Hebrews 11:2 For by it the men of old gained approval.

Hebrews 12:24 and to Jesus, the mediator of a new covenant, and to the sprinkled blood, which speaks better than the blood of Abel.

1 John 3:12 not as Cain, who was of the evil one and slew his brother. And for what reason did he slay him? Because his deeds were evil, and his brother's were righteous. (NASB ©1995)