1 Corinthians 16:1,2 - Joseph Benson’s Commentary on the Old and New Testaments

Now concerning the collection During the apostle's eighteen months' abode at Corinth, he had exhorted the brethren there to undertake the making a collection for the poor saints in Judea. But the divisions in their church, it seems, had hitherto hindered them from beginning it. The apostle therefore here requests them to set about it immediately, and directs them as to the mode of proceeding. The saints in Judea were, it appears, at this time, in great straits, both on account of a famine, and the persecution to which they were exposed. As I have given order, or a charge, Greek, διεταξα, to the churches of Galatia It is probable the apostle gave these orders to the churches of Galatia when he went throughout Phrygia and the region of Galatia, establishing the churches, as mentioned Acts 16:6. And he may have received the collections made by these churches when, in his way to Ephesus, where he now was, he went through all the churches of those parts in order, as related Acts 18:23.