Genesis 4:8

We have here the progress of Cain's anger, and the issue of it in Abel's murder, which may be considered two ways: - I. As Cain's sin; and a scarlet, crimson, sin it was, a sin of the first magnitude, a sin against the light and law of nature, and which the consciences even of bad men have startled at. See in it, 1. The sad effects of sin's entrance into the world and into the hearts of men. See what a root of bitterness the corrupt nature is, which bears this gall and wormwood. Adam's eating forbidden fruit seemed but a little sin, but it opened the door to the greatest. 2. A fruit of the enmity which is in the seed of the serpent against the seed of the woman. As Abel leads the van in the noble army of martyrs (Mat 23:35), so Cain stand in the front of the ignoble army of persecutors, Jde 1:11. So early did he that was after the flesh persecute him that was after the Spirit; and so it is now, more or less (Gal 4:29), and so it will be till the war shall end in the eternal salvation of all the saints and the eternal perdition of all that hate them. 3. See also what comes of envy, hatred, malice, and all uncharitableness; if they be indulged and cherished in the soul, they are in danger of involving men in the horrid guilt of murder itself. Rash anger is heart-murder, Mat 5:21, Mat 5:22. Much more is malice so; he that hates his brother is already a murderer before God; and, if God leave him to himself, he wants nothing but an opportunity to render him a murderer before the world. Many were the aggravations of Cain's sin. (1.) It was his brother, his own brother, that he murdered, his own mother's son (Psa 50:20), whom he ought to have loved, his younger brother, whom he ought to have protected. (2.) He was a good brother, one who had never done him any wrong, nor given…

4:8 The effects of the Fall on human relationships are tragically expressed in the first murder. • The word brother is used seven times in 4:2-11, highlighting Cain’s fratricide in the face of familial responsibility.