Romans 15:20

My ambition has been, however, to preach the gospel where Christ's name was not already known, so that I might not build upon another man's foundation.

2 Corinthians 10:13-16

I, however, will not indulge in undue boasting, but will confine it within the limits of the sphere to which God has assigned me?? sphere which reaches even to you.

1 Corinthians 3:9-15

For we are God's fellow workers; and you are God's field, you are God's building.

Ephesians 2:20-22

You are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner-stone.

Treasury of Scripture Knowledge

Summary

Yea, so have I strived to preach the gospel, not where Christ was named, lest I should build upon another man's foundation:

Bible References

So

2 Corinthians 10:14
For I am not overstepping the limits of my authority, as though I reached you not; since I have already come even as far as Corinth to proclaim the gospel of Christ.

Build

1 Corinthians 3:9
For we are God's fellow workers; and you are God's field, you are God's building.
2 Corinthians 10:13
I, however, will not indulge in undue boasting, but will confine it within the limits of the sphere to which God has assigned me?? sphere which reaches even to you.
Ephesians 2:20
You are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner-stone.