1 Corinthians 16:2

Every Sunday. Sunday was the "Lord's Day," and the church would meet to worship God on that day. Compare note on Acts 20:7. [Some calendars show Monday as the "first day of the week," but this is not correct.] Put aside some money. MacKnight writes: "On the first day of every week, let each of you lay somewhat by itself, suitable to the gains of the preceding week, putting it into the appointed treasury." In proportion. Under the Law, a fixed percentage was required. In Christ's church, it is YOU WHO decide the percentage (2 Corinthians 9:7). So that there will be no need. This implies the existence of a common treasury. When Paul comes, the money will be already collected and waiting for him.