Luke 21:15

for I will make you speak with such strength of argument, as all your adversaries shall not be able to contradict or withstand.

Acts 6:10

but as they were not able to withstand the force of that sublime knowledge which appeared in his discourse,

Luke 12:12

for the holy spirit shall instruct you on the very occasion, what is proper to be said.

Luke 24:45

then he open'd their minds to make them understand the scriptures, and said to them,

Acts 2:4

and they were all filled with the holy ghost, and began to speak in different languages, 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 senators of Israel,

Acts 4:31-33

When they had prayed, the place where they were assembled, trembled; they were all filled with the holy spirit, and they spake the word of God with boldness.

Acts 24:25

but as he was treating of justice, temperance, and a future judgment, Felix greatly alarm'd, said, "withdraw for the present; and when I am at leisure, I will send for you."

Acts 26:28

but Agrippa reply'd to Paul, you almost persuade me I shall be a christian!

Ephesians 6:19

in particular for me, that I may have leave to speak without any restraint, and make known the mystery of the gospel,

Colossians 4:3-4

put up your requests likewise for me, that God would give me an opportunity to declare the mystery of Christ (for which I am even in bonds:)

2 Timothy 4:16-17

At my first defence, I had no assistance, for every body deserted me. I wish it may never be laid to their charge.

James 1:5

If any of you is deficient in prudence, let him ask it of God, who liberally gives to all without upbraiding: and he will give it.

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
but as they were not able to withstand the force of that sublime knowledge which appeared in his discourse,
Acts 24:25
but as he was treating of justice, temperance, and a future judgment, Felix greatly alarm'd, said, "withdraw for the present; and when I am at leisure, I will send for you."
Acts 26:28
but Agrippa reply'd to Paul, you almost persuade me I shall be a christian!
2 Timothy 4:16
At my first defence, I had no assistance, for every body deserted me. I wish it may never be laid to their charge.

General references

Luke 12:12
for the holy spirit shall instruct you on the very occasion, what is proper to be said.
Luke 14:6
and they could not tell what to reply to it.
Acts 21:37
just as he was entring into the castle, Paul said to the officer, may I be favour'd with a word? you can speak Greek then, said he?
1 Corinthians 1:27
but God hath chosen those who are foolish in the opinion of the world, to confound the wise; and the weak men of the world to confound the mighty: