Luke 21:15

For I will give you a mouth and wisdom, which all your adversaries will not be able to withstand or gainsay.

Acts 6:10

and they were not able to resist the wisdom and the Spirit with which he spoke.

Luke 12:12

for the Holy Spirit will teach you in that very hour what ye ought to say.

Luke 24:45

Then he opened their understanding, that they might understand the Scriptures.

Acts 2:4

And they were all filled with the Holy Spirit, and began to speak with other tongues, even as the Spirit gave them utterance.

Acts 4:8-13

Then Peter, filled with the Holy Spirit, said to them, Rulers of the people, and elders of Israel!

Acts 4:31-33

And when they had prayed, the place was shaken where they were assembled; and they were all filled with the Holy Spirit, and they spoke the word of God with boldness.

Acts 24:25

And as he discoursed of righteousness, and temperance, and the judgment to come, Felix became alarmed, and answered, Go thy way for the present; and when I have a convenient season, I will call for thee.

Acts 26:28

Then Agrippa said to Paul, With little effort thou thinkest to persuade me to become a Christian.

Ephesians 6:19

and for me, that utterance may be given me in the opening of my mouth, to make known with boldness the mystery of the gospel,

Colossians 4:3-4

praying at the same time for us also, that God may open to us a door for the word, to speak the mystery of Christ, for the sake of which I am also in bonds;

2 Timothy 4:16-17

At my first defence no one came forward with me, but all forsook me. May it not be laid to their charge!

James 1:5

But if any one of you is wanting in wisdom, let him ask of God, who giveth to all liberally, and upbraideth not; and it will be given him.

Treasury of Scripture Knowledge

Summary

For I will give you a mouth and wisdom, which all your adversaries shall not be able to gainsay nor resist.

Bible References

Which

Acts 6:10
and they were not able to resist the wisdom and the Spirit with which he spoke.
Acts 24:25
And as he discoursed of righteousness, and temperance, and the judgment to come, Felix became alarmed, and answered, Go thy way for the present; and when I have a convenient season, I will call for thee.
Acts 26:28
Then Agrippa said to Paul, With little effort thou thinkest to persuade me to become a Christian.
2 Timothy 4:16
At my first defence no one came forward with me, but all forsook me. May it not be laid to their charge!

General references

Luke 12:12
for the Holy Spirit will teach you in that very hour what ye ought to say.
Luke 14:6
And they could make no answer to this.
Acts 21:37
And as he was about to be led into the castle, Paul saith to the chief captain, May I speak to thee? And he said, Canst thou speak Greek?
1 Corinthians 1:27
but the foolish things of the world did God choose, to put to shame the wise; and the weak things of the world did God choose, to put to shame the things which are strong;