2 Corinthians 7:12

Although, then, I wrote to you, it was not on account of him that did the wrong, nor of him who suffered wrong; but that your earnestness for us might be made manifest to you in the sight of God.

2 Corinthians 2:9

For to this end also I wrote, that I might know by putting it to the proof, whether ye are obedient in all things.

1 Corinthians 5:1-2

It is everywhere reported that there is fornication among you, and such fornication as is not even among the gentiles, that one should have his fathers wife.

2 Corinthians 2:3-4

And I wrote about this very matter, that I might not on my coming have sorrow from those who ought to gladden me, having confidence in all of you, that my joy is the joy of you all.

2 Corinthians 2:17

For we are not as the many, who adulterate the word of God; but as from sincerity, but as from God, in the sight of God we speak in Christ.

2 Corinthians 7:8

For though I caused you sorrow with the letter, I do not regret it, though I did regret it; for I perceive that that letter caused you sorrow, though it was but for a short time.

2 Corinthians 11:11

Wherefore? Because I love you not? God knoweth!

2 Corinthians 11:28

Besides the other troubles, there is that which presseth upon me daily, the anxiety for all the churches.

1 Timothy 3:5

for if a man knoweth not how to preside over his own house, how shall he take care of the church of God

Treasury of Scripture Knowledge

Summary

Wherefore, though I wrote unto you, I did it not for his cause that had done the wrong, nor for his cause that suffered wrong, but that our care for you in the sight of God might appear unto you.

Bible References

I did

2 Corinthians 2:9
For to this end also I wrote, that I might know by putting it to the proof, whether ye are obedient in all things.
1 Corinthians 5:1
It is everywhere reported that there is fornication among you, and such fornication as is not even among the gentiles, that one should have his fathers wife.

That our

2 Corinthians 2:4
For out of much distress and anguish of heart I wrote to you with many tears, not that ye should be made sorrowful, but that ye might know the exceeding love which I have for you.
2 Corinthians 11:11
Wherefore? Because I love you not? God knoweth!
1 Timothy 3:5
for if a man knoweth not how to preside over his own house, how shall he take care of the church of God