1 Corinthians 15:11

Whether, then, it was I or whether it was they, this we proclaim, and this you believed.

1 Corinthians 2:2

For I had determined that, while with you, I would know nothing but Jesus Christ-and him crucified!

1 Corinthians 15:3-4

For at the very beginning of my teaching I gave you the account which I had myself received-that Christ died for our sins (as the Scriptures had foretold),

Treasury of Scripture Knowledge

Summary

Therefore whether it were I or they, so we preach, and so ye believed.

Bible References

General references

1 Corinthians 15:3
For at the very beginning of my teaching I gave you the account which I had myself received-that Christ died for our sins (as the Scriptures had foretold),
1 Corinthians 2:2
For I had determined that, while with you, I would know nothing but Jesus Christ-and him crucified!