Romans 15:20
Now it has been my ambition to preach the good news at places where Christ's name has never been heard, so that I would not be building on someone else's foundation.
2 Corinthians 10:13-16
But we will not boast beyond our proper boundaries [Note: This may mean that Paul was not attempting to exercise apostolic authority outside the parameters assigned to him by God], but will restrict our boasting to the area assigned to us by God as a field of service, which includes you people [there in Corinth].
1 Corinthians 3:9-15
For we are all fellow-workers in God's service; you people are God's farm land; [you are] God's building.
Ephesians 2:20-22
[You are] built on the foundation of the apostles and prophets [See I Cor. 12:28], with Christ Jesus Himself being the principal stone by which the entire building is aligned.