And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering:

Wesley's Notes

4:4 And the Lord God had respect to Abel and to his offering, and shewed his acceptance of it, probably by fire from heaven but to Cain and to his offering he had not respect. We are sure there was a good reason for this difference: that Governor of the world, though an absolute sovereign, doth not act arbitrarily in dispensing his smiles and frowns. There was a difference in the characters of the persons offering: Cain was a wicked man, but Abel was a righteous man, Mt 23:35. There was a difference in the offerings they brought. Abel's was a more excellent sacrifice than Cain's; Cain's was only a sacrifice of acknowledgment offered to the Creator; the meat - offerings of the fruit of the ground were no more: but Abel brought a sacrifice of atonement, the blood whereof was shed in order to remission, thereby owning himself a sinner, deprecating God's wrath, and imploring his favour in a Mediator. But the great difference was, Abel offered in faith, and Cain did not. Abel offered with an eye to God's will as his rule, and in dependence upon the promise of a Redeemer. But Cain did not offer in faith, and so it turned into sin to him.

King James Translators' Notes

flock: Heb. sheep, or, goats

Scofield Reference Notes

[4] Abel

Abel ("exhalation," or, "that which ascends") is a type of the spiritual man. His sacrifice, in which atoning blood was shed Heb 9:22 was therefore at once his confession of sin and the expression of his faith in the interposition of a substitute Heb 11:4.

[5] flock

Type of Christ, the Lamb of God, the most constant type of the suffering Messiah--"the Lamb of God that taketh away the sin of the world" Jn 1:29.

A lamb fitly symbolizes the unresisting innocency and harmlessness of the Lord Jesus Isa 53:7 Lk 23:9 Mt 26:53,54. This type is brought into prominence by contrast with Cain's bloodless offering of the fruit of his own works, and proclaims, in the very infancy of the race, the primal truth that "without shedding of blood is no remission" Heb 9:22 11:4.

Jamieson-Fausset-Brown Bible Commentary

4. the Lord had respect unto Abel, not unto Cain, &c.-The words, "had respect to," signify in Hebrew,-"to look at any thing with a keen earnest glance," which has been translated, "kindle into a fire," so that the divine approval of Abel's offering was shown in its being consumed by fire (see Ge 15:17; Jud 13:20).

Matthew Henry's Concise Commentary

4:1-7 When Cain was born, Eve said, I have gotten a man from the Lord. Perhaps she thought that this was the promised seed. If so, she was wofully disappointed. Abel signifies vanity: when she thought she had the promised seed in Cain, whose name signifies possession, she was so taken up with him that another son was as vanity to her. Observe, each son had a calling. It is the will of God for every one to have something to do in this world. Parents ought to bring up their children to work. Give them a Bible and a calling, said good Mr. Dod, and God be with them. We may believe that God commanded Adam, after the fall, to shed the blood of innocent animals, and after their death to burn part or the whole of their bodies by fire. Thus that punishment which sinners deserve, even the death of the body, and the wrath of God, of which fire is a well-known emblem, and also the sufferings of Christ, were prefigured. Observe that the religious worship of God is no new invention. It was from the beginning; it is the good old way, Jer 6:16. The offerings of Cain and Abel were different. Cain showed a proud, unbelieving heart. Therefore he and his offering were rejected. Abel came as a sinner, and according to God's appointment, by his sacrifice expressing humility, sincerity, and believing obedience. Thus, seeking the benefit of the new covenant of mercy, through the promised Seed, his sacrifice had a token that God accepted it. Abel offered in faith, and Cain did not, Heb 11:4. In all ages there have been two sorts of worshippers, such as Cain and Abel; namely, proud, hardened despisers of the gospel method of salvation, who attempt to please God in ways of their own devising; and humble believers, who draw near to him in the way he has revealed. Cain indulged malignant anger against Abel. He harboured an evil spirit of discontent and rebellion against God. God notices all our sinful passions and discontents. There is not an angry, envious, or fretful look, that escapes his observing eye. The Lord reasoned with this rebellious man; if he came in the right way, he should be accepted. Some understand this as an intimation of mercy. If thou doest not well, sin, that is, the sin-offering, lies at the door, and thou mayest take the benefit of it. The same word signifies sin, and a sacrifice for sin. Though thou hast not done well, yet do not despair; the remedy is at hand. Christ, the great sin-offering, is said to stand at the door, Re 3:20. And those well deserve to perish in their sins, that will not go to the door to ask for the benefit of this sin-offering. God's acceptance of Abel's offering did not change the birthright, and make it his; why then should Cain be so angry? Sinful heats and disquiets vanish before a strict and fair inquiry into the cause.