Romans 15:31

That I may be delivered from them that do not believe in Judaea; and that my service which I have for Jerusalem may be accepted of the saints;

As he went to Judea and Jerusalem, Paul was carrying the gospel to those there who opposed it and opposed Jesus as Saviour of the world. He asked fellow believers, the Gentile Christians, to strive together with him in prayer to God for him. They were to pray that God would protect and bless him and deliver and rescue him from the unbelievers in Judea who opposed the gospel. They were also to pray that his service for Jerusalem would be accepted by the saints. Such praying would help open the way for the gospel to be received.

His service for Jerusalem shows that this kind of service requires a sanctified mind and sanctified speech, and only when brain-power and the talent of speech are sanctified is a person fitted for it. The same duty binds believers to unite in intercession for God's appointed workers for their protection and blessing instead of talking about one another's faults, speaking only kind, encouraging words with speech sanctified and cleansed from faultfinding. That means guarding the tongue, refusing to listen to criticism, answering harsh provocation with silence, and keeping the eye fixed on Jesus, who points out perils in order to rescue from them.