Romans 15:26
For it hath pleased them of Macedonia and Achaia to make a certain contribution for the poor saints which are at Jerusalem.
Cross-reference
In Matthew 25:40, Jesus identifies serving the needy as serving him — directly undergirds the motivation for this collection.
Acts 11:27-30 records a famine relief collection for Judean believers — the same kind of contribution for poor saints that Paul describes here.
2 Corinthians 8:1 highlights the Macedonians' generosity in the collection — the very same offering Paul mentions from Macedonia and Achaia.
In 2 Corinthians 9:12, Paul describes the same collection as supplying needs and producing thanksgiving — directly parallel.
Acts 24:17 explicitly states Paul brought alms to his nation—direct reference to this same collection.
2 Corinthians 8:4 describes the same collection for Jerusalem saints, showing how the churches eagerly participated in this relief effort.
2 Corinthians 8:13 discusses fairness in the same collection, echoing the principle of mutual support behind the gift from Macedonia and Achaia.
Acts 19:21 shows Paul's plan to go through Macedonia and Achaia to Jerusalem—the itinerary behind the collection.
In Matthew 26:11, Jesus notes the poor are always present — affirms the ongoing need behind this contribution.