Genesis 4:3

“And in process of time it came to pass, etc.] Or “at the end of days” f251; 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 (<071104>Judges 11:4 *marg) 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…”

“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" [Gen 4:4].”

“- Section IV - The Family of Adam - Cain and Abel 1. קין qayı̂n, Qain (Cain), “spear-shaft,” and קנה qānah, “set up, establish, gain, buy,” contain the biliteral root קן qan, “set up, erect, gain.” The relations of root words are not confined to the narrow rules of our common etymology, but really extend to such instinctive usages as the unlettered speaker will invent or employ. A full examination of the Hebrew tongue leads to the conclusion that a biliteral root lies at the base of many of those triliterals that consist of two firm consonants and a third weaker one varying in itself and its position. Thus, יטב yāṭab and טיב ṭôb. So קין qayı̂n and קנה qānah grow from one root. 2. הבל…”

“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. Genesis 4:4”

“4:3 There was nothing wrong with offering grain to the Lord (Lev 2:14; Deut 26:2-4), but Cain brought only a token gift (some of his crops), whereas God requires the first and best (Exod 23:16, 19; 34:22, 26). Cain’s heart attitude made his offering inferior to Abel’s (cp. Heb 11:4).”

“am 129, bc 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. Kg1 17:7; Neh 13:6 the fruit: Lev 2:1-11; Num 18:12 Genesis 4:4”