1 Corinthians 16:2 - Matthew Poole's English Annotations on the Holy Bible

From hence both divers of the ancients, and very many late divines, argue for the change of the sabbath from the seventh day of the week to the first. It is plain from hence, that the gospel churches were wont to assemble upon that day; nor do we read in Scripture of any assembly of Christians for religious worship on any other day. On this day the apostle orders collections for the poor saints to be made, accordingly as God had prospered any in their employments; he directeth that they should every one lay by him something, not doing what he did with any ostentation, but having it ready when it should be called for: this he calls a treasuring (so it is in the Greek); monies laid by for charitable uses are treasures, both with respect to those for whom they are laid up, and also for ourselves; for he that giveth to the poor, layeth up for himself treasures in heaven. He would have no gatherings when he came, either to avoid the scandal of his being chargeable to them, or that he would have no delay, but when he came it might be in a readiness to be presently sent away.