Romans 15:25-28 : But now, I say, I go unto Jerusalem, ministering unto the saints. For it hath been the good pleasure of Macedonia and Achaia to make a certain contribution for the poor among the saints that are at Jerusalem. Yea, it hath been their good pleasure; and their debtors they are. For if the Gentiles have been made partakers of their spiritual things, they owe it to them also to minister unto them in carnal things. When therefore I have accomplished this, and have sealed to them this fruit, I will go on by you unto Spain. Before visiting them on his intended journey into Spain, he had a mission to fulfill in Jerusalem.
For sometime he had been stirring up the churches of the Gentiles to make contributions for the poor saints in Judea. Many facts concerning this collection for the saints may be learned from 1 Corinthians 16:1-4; 2 Corinthians 8:1-7; 2 Corinthians 9:1-15. Through the instrumentality of the Jews, yet in spite of some Jews, the Gentiles had received the gospel. These Gentile Christians felt an obligation therefore to do what they could to supply the material needs of the poor saints in Judea. Paul now promises to visit Rome on his way to Spain, after he had com-pleted the business of taking the contributions of the churches to Jerusalem. And he did go to Rome, but how he was to go had not been then revealed to him.
If he ever reached Spain, we have no record of it.