1 Corinthians 16:2

But, when he came, as to the disposal of it, he would leave it much to themselves. The charity was theirs, and it was fit they should dispose of it in their own way, so it answered its end, and was applied to the right use. Paul no more pretended to lord it over the purses of his hearers than over their faith; he would not meddle with their contributions without their consent.

Here is the time when this is to be done: The first day of the week, kata mian sabbaton ( Luke xxiv. 1 ), the Lord's day, the Christian holiday, when public assemblies were held and public worship was celebrated, and the Christian institutions and mysteries (as the ancients called them) were attended upon; then let every one lay by him.

The primary object of the sabbath is holiness, not merely rest: "Remember that thou keep holy the sabbath day." Compare Ge 2:3, "God blessed and sanctified it, because . . . in it He had rested," &c. The word "Remember" implies that it was in existence before the giving of the law from Sinai, and refers to its institution in Paradise (compare Ex 16:22, 23, 26, 30).

Upon the first day of the week - The apostle prescribes the most convenient and proper method of making this contribution. 1. Every man was to feel it his duty to succor his brethren in distress. 2. He was to do this according to the ability which God gave him. 3. He was to do this at the conclusion of the week, when he had cast up his weekly earnings, and had seen how much God had prospered his labor.

Upon the first day of the week - Greek, “On one of the Sabbaths.” The Jews, however, used the word Sabbath to denote the week; the period of seven days; Mat 28:1; Mar 16:9; Luk 18:12; Luk 24:1; Joh 20:1, Joh 20:19; compare Lev 23:15; Deu 16:9. It is universally agreed that this here denotes the first day of the week, or the Lord’s Day. Let every one of you - Let the collection be universal. Let each one esteem it his duty and his privilege to give to this object. It was not to be confined to the rich only, but was the common duty of all. The poor, as well as the rich, were expected to contribute according to their ability. Lay by him in store - (παρ ̓ ἑαυτῷ τιθέτω θησαυρίζων par' heautō tithetō thēsaurizōn). Let him lay up at home, treasuring up as he has been prospered. The Greek phrase, “by himself,” means, probably, the same as at home. Let him set it apart; let him designate a certain portion; let him do this by himself, when he is at home, when he can calmly look at the evidence of his prosperity. Let him do it not under the influence of pathetic appeals, or for the sake of display when he is with others; but let him do it as a matter of principle, and when he is by himself. The phrase in Greek, “treasuring up,” may mean that each one was to put the part which he had designated into the common treasury. This interpretation seems to be demanded by the latter part of the verse. They were to lay it by, and to put it into the common treasury, that there might be no trouble of collecting when he should come. Or it may, perhaps, mean that they were individually to treasure it up, having designated in their own mind the sum which they could give, and have it in readiness when he should come. […]