At the end of days. - This may denote the end of the week, of the year, or of some longer period. The season of the year was probably the ingathering, when the fruits of the earth and the firstlings of the flock would come in, and when it was not unnatural for the first family to celebrate with a subdued thankfulness the anniversary of their creation. And the present occasion seems to have been the time when Cain and Habel, have arrived at the years of discretion and self-dependence, solemnly come forward with their first voluntary offerings to the Lord. Hitherto they may have come under their parents, who were then the actual offerers. Now they come on their own account.
Here, accordingly, we ascend from the secular to the eternal. We find a church in the primeval family. If Cain and Habel offer to God, we may imagine it was the habit of their parents, and has descended to them with all the sanction of parental example. But we may not venture to affirm this in all its extent. Parental example they no doubt had, in some respects; but whether Adam and Eve had yet ascended so far from the valley of repentance and humiliation as to make bold to offer anything to the Lord, admits of question. Right feeling in the first offenders would make the confidence of faith very slow of growth. It is even more natural for their children, being one remove from the actual transgressors, to make the first essay to approach God with an offering.
Cain brings of the fruits of the soil. We cannot say this was the mere utterance of nature giving thanks to the Creator for his benefits, and acknowledging that all comes from him, and all is due to him. History, parental instruction, and possibly example, were also here to give significance to the act. The offering is also made to Yahweh, the author of nature, of revelation, and now, in man's fallen state, of grace. There is no intimation in this verse of the state of Cain's feelings toward God. And there is only a possible hint, in the "coats of skin," in regard to the outward form of offering that would be acceptable. We must not anticipate the result.

In process of time - מקץ ימים mikkets yamim, at the end of days. Some think the anniversary of the creation to be here intended; it is more probable that it means the Sabbath, on which Adam and his family undoubtedly offered oblations to God, as the Divine worship was certainly instituted, and no doubt the Sabbath properly observed in that family. This worship was, in its original institution, very simple. It appears to have consisted of two parts:
1. Thanksgiving to God as the author and dispenser of all the bounties of nature, and oblations indicative of that gratitude.
2. Piacular sacrifices to his justice and holiness, implying a conviction of their own sinfulness, confession of transgression, and faith in the promised Deliverer. If we collate the passage here with the apostle's allusion to it, Hebrews 11:4, we shall see cause to form this conclusion.
Cain brought of the fruit of the ground an offering - מנחה minchah, unto the Lord. The word minchah is explained, Leviticus 2:1, etc., to be an offering of fine flour, with oil and frankincense. It was in general a eucharistic or gratitude offering, and is simply what is implied in the fruits of the ground brought by Cain to the Lord, by which he testified his belief in him as the Lord of the universe, and the dispenser of secular blessings.

And in process of time it came to pass, that Cain brought of the fruit of the ground an (c) offering unto the LORD.
(c) This declares that the father instructed his children in the knowledge of God, and also how God gave them sacrifices to signify their salvation, though they were destitute of the ordinance of the tree of life.

And in process of time it came to pass,.... Or "at the end of days" (c); which some understand of the end of seven days, at the end of the week, or on the seventh day, which they suppose to be the sabbath day, these sons of Adam brought their offerings to the Lord: but this proceeds upon an hypothesis not sufficiently established, that the seventh day sabbath was now appointed to be observed in a religious way; rather, according to Aben Ezra, it was at the end of the year; So "after days" in Judges 11:4 is meant after a year; and which we there render, as here, "in process of time". This might be after harvest, after the fruits of the earth were gathered in, and so a proper season to bring an offering to the Lord, in gratitude for the plenty of good things they had been favoured with; as in later times, with the Israelites, there was a feast for the ingathering of the fruits of the earth, Exodus 23:16. The Targum of Jonathan fixes this time to the fourteenth of Nisan, as if it was the time of the passover, a feast instituted two thousand years after this time, or thereabout; and very stupidly one of the Jewish writers (d) observes, that"the night of the feast of the passover came, and Adam said to his sons, on this night the Israelites will bring the offerings of the passovers, offer ye also before your Creator."
That Cain brought of the fruit of the ground an offering unto the Lord; corn, herbs, seeds, &c. the Targum of Jonathan says it was flax seed; so Jarchi makes mention of an "agadah" or exposition, which gives the same sense; and another of their writers (e) observes, that Cain brought what was left of his food, or light and trifling things, flax or hemp seed. This he brought either to his father, as some think, being priest in his family; or rather he brought and offered it himself at the place appointed for religious worship, and for sacrifices; so Aben Ezra, he brought it to the place fixed for his oratory. It is highly probable it was at the east of the entrance of the garden of Eden, where the Shechinah, or the divine Majesty, was, and appeared in some remarkable manner.
(c) "in fine dierum", Pagninus, Montanus; "a fine dierum", Schmidt. (d) Pirke Eliezer, c. 21. (e) Ib. Vid. Tzeror Hammor, fol. 8. 2.

in process of time--Hebrew, "at the end of days," probably on the Sabbath.
brought . . . an offering unto the Lord--Both manifested, by the very act of offering, their faith in the being of God and in His claims to their reverence and worship; and had the kind of offering been left to themselves, what more natural than that the one should bring "of the fruits of the ground," and that the other should bring "of the firstlings of his flock and the fat thereof" [Genesis 4:4].

In process of time - At the end of days, either at the end of the year when they kept their feast of in - gathering, or at the end of the days of the week, the seventh day; at some set time Cain and Abel brought to Adam, as the priest of the family, each of them an offering to the Lord; for which we have reason to think there was a divine appointment given to Adam, as a token of God's favour notwithstanding their apostacy.