What did Paul exhort the saints in Rome to do in his behalf?...

To add their prayers to his that he would be delivered from the wrath of the Israelites in Jerusalem who had rejected their Christ, and that the large offering of money he was bringing with him would be acceptable to the poor saints there.

Paul knew the determination of the Pharisees to destroy the Christian faith. The Pharisees had murdered Jesus, James, Stephen, and others. Paul knew the Pharisees would not hesitate to imprison or kill any person who received Jesus of Nazareth as Christ. Paul himself had viciously persecuted the Christian families.

Paul understood that there was a good chance he would be put to death as soon as he arrived in Jerusalem.