Romans 15:20

but being so ambitious not to preach the gospel, where Christ has been named, in order that I may not build on another man's foundation;

2 Corinthians 10:13-16

But we will not boast in things without measure, but according to the measure of the rule which measure God has measured to us, to reach even unto you.

1 Corinthians 3:9-15

For we are God's fellow-laborers; ye are God's farm; ye are God's building.

Ephesians 2:20-22

having been built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief cornerstone,

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 not as not reaching unto you do we stretch ourselves, for we have advanced in the gospel of Christ even unto you:

Build

1 Corinthians 3:9
For we are God's fellow-laborers; ye are God's farm; ye are God's building.
2 Corinthians 10:13
But we will not boast in things without measure, but according to the measure of the rule which measure God has measured to us, to reach even unto you.
Ephesians 2:20
having been built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief cornerstone,