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.

A.M.

129. B.C.

3875. in process of time. Heb. at the end of days. Either at the end of the year, or of the week, i.e., on the Sabbath.

1 Kings 17:7 And it came to pass after a while, that the brook dried up, because there had been no rain in the land.

Nehemiah 13:6 But in all this time was not I at Jerusalem: for in the two and thirtieth year of Artaxerxes king of Babylon came I to the king...

the fruit.

Leviticus 2:1-11 And when any will offer a meat offering to the LORD, his offering shall be of fine flour; and he shall pour oil on it...

Numbers 18:12 All the best of the oil, and all the best of the wine, and of the wheat, the first fruits of them which they shall offer to the LORD...

Cain and Abel. Gen 4:3-8
CAIN and ABEL. Gen 4:3-8 When Adam fell he quickly lost God's image, which he once possessed: See All our nature since could boast In Cain, his first-born Son, expressed! The sacrifice the Lord ordained In type of the Redeemer's blood, Self-righteous reas'ning Cain disdained, And thought his own first-fruits as good. Yet rage and envy filled his mind, When, with a fallen, downcast look, He saw his brother favor find, Who GOD's appointed method took. By Cain's own hand, good Abel died, Because …
John Newton—Olney Hymns

Extracts No. vii.
[In this number the objector gives the whole ground of his objections, and the reasons for his doubts: which he states as follows, viz. "1. Mankind, in all ages of the world, have been, and still are prone to superstition. "2. It cannot be denied, but that a part of mankind at least, have believed, and still are believing in miracles and revelation, which are spurious. "3. The facts on which religion is predicated are unlike every thing of which we have any positive knowledge." Under the first …
Hosea Ballou—A Series of Letters In Defence of Divine Revelation

The Faith of Abraham.
"By faith Abraham, when he was called, obeyed to go out unto a place which he was to receive for an inheritance; and he went out, not knowing whither he went. By faith he became a sojourner in the land of promise, as in a land not his own, dwelling in tents, with Isaac and Jacob, the heirs with him of the same promise: for he looked for the city which hath the foundations, whose Builder and Maker is God. By faith even Sarah herself received power to conceive seed when she was past age, since she …
Thomas Charles Edwards—The Expositor's Bible: The Epistle to the Hebrews