Romans 15:20

and, making it my aim so to proclaim the Gospel??ot where Christ was already named??hat I might not build upon another's foundation;

2 Corinthians 10:13-16

But we will not glory beyond our measure, but according to the measure of the limit which God apportioned to us as a measure, to reach even to you.

1 Corinthians 3:9-15

For we are God's fellow-workers; ye are God's husbandry, God's building.

Ephesians 2:20-22

having been built upon the foundation of the apostles and prophets, Christ Jesus 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 we stretch not ourselves overmuch, as if not reaching to you; for we came even as far as to you in the Gospel of Christ;

Build

1 Corinthians 3:9
For we are God's fellow-workers; ye are God's husbandry, God's building.
2 Corinthians 10:13
But we will not glory beyond our measure, but according to the measure of the limit which God apportioned to us as a measure, to reach even to you.
Ephesians 2:20
having been built upon the foundation of the apostles and prophets, Christ Jesus Himself being the chief corner-stone;