I Corinthians 15:58-16:3 (17th and 19th Saturday after Pentecost)
Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that in the Lord your labor is not in vain.
Now concerning the contribution for the saints: as I directed the churches of Galatia, so you also are to do. On the first day of every week, each of you is to put something aside and store it up, as he may prosper, so that contributions need not be made when I come. And when I arrive, I will send those whom you accredit by letter to carry your gift to Jerusalem.