2 Corinthians 13:3

since you want a practical proof of the fact that Christ speaks by my lips--He who is not feeble towards you, but powerful among you.

Matthew 10:20

for it is not you who will speak: it will be the Spirit of your Father speaking through you.

Matthew 18:18-20

I solemnly tell you that whatever you as a Church bind on earth will in Heaven be held as bound, and whatever you loose on earth will in Heaven be held to be loosed.

Luke 21:15

for I will give you utterance and wisdom which none of your opponents will be able to withstand or reply to.

1 Corinthians 5:4-5

In the name of our Lord Jesus, when you are all assembled and my spirit is with you, together with the power of our Lord Jesus,

1 Corinthians 9:1-3

Am I not free? Am I not an Apostle? Can it be denied that I have seen Jesus, our Lord? Are not you yourselves my work in the Lord?

2 Corinthians 2:6

In the case of such a person the punishment which was inflicted by the majority of you is enough.

2 Corinthians 2:10

When you forgive a man an offence I also forgive it; for in fact what I have forgiven, if I have forgiven anything, has always been for your sakes in the presence of Christ,

2 Corinthians 3:1-3

Do you say that this is self-recommendation once more? Or do we need, as some do, letters of recommendation to you or from you?

2 Corinthians 10:4

The weapons with which we fight are not human weapons, but are mighty for God in overthrowing strong fortresses.

2 Corinthians 10:8-10

If, however, I were to boast more loudly of our Apostolic authority, which the Lord has given us that we may build you up, not pull you down, I should have no reason to feel ashamed.

2 Corinthians 12:12

The signs that characterize the true Apostle have been done among you, accompanied by unwearied fortitude, and by tokens and marvels and displays of power.

Treasury of Scripture Knowledge

Summary

Since ye seek a proof of Christ speaking in me, which to you-ward is not weak, but is mighty in you.

General references

Bible References

Ye seek

2 Corinthians 10:8
If, however, I were to boast more loudly of our Apostolic authority, which the Lord has given us that we may build you up, not pull you down, I should have no reason to feel ashamed.

Christ

2 Corinthians 2:10
When you forgive a man an offence I also forgive it; for in fact what I have forgiven, if I have forgiven anything, has always been for your sakes in the presence of Christ,
Matthew 10:20
for it is not you who will speak: it will be the Spirit of your Father speaking through you.
Matthew 18:18
I solemnly tell you that whatever you as a Church bind on earth will in Heaven be held as bound, and whatever you loose on earth will in Heaven be held to be loosed.
Luke 21:15
for I will give you utterance and wisdom which none of your opponents will be able to withstand or reply to.
1 Corinthians 5:4
In the name of our Lord Jesus, when you are all assembled and my spirit is with you, together with the power of our Lord Jesus,

Which

2 Corinthians 2:6
In the case of such a person the punishment which was inflicted by the majority of you is enough.
2 Corinthians 3:1
Do you say that this is self-recommendation once more? Or do we need, as some do, letters of recommendation to you or from you?
2 Corinthians 12:12
The signs that characterize the true Apostle have been done among you, accompanied by unwearied fortitude, and by tokens and marvels and displays of power.
1 Corinthians 9:1
Am I not free? Am I not an Apostle? Can it be denied that I have seen Jesus, our Lord? Are not you yourselves my work in the Lord?

General references

2 Corinthians 13:6
But I trust that you will recognize that we are not insincere.