Luke 21:15

for I will give you a mouth [i.e., the ability to speak properly] and wisdom [i.e., the knowledge of what to say], which none of your opponents will be able to resist or speak against.

Acts 6:10

But they could not stand up to the wisdom and [power of] the Holy Spirit by which Stephen spoke.

Treasury of Scripture Knowledge

Summary

And it came to pass, when David had made an end of speaking these words unto Saul, that Saul said, Is this thy voice, my son David? And Saul lifted up his voice, and wept.

Bible References

Is this

Luke 21:15
for I will give you a mouth [i.e., the ability to speak properly] and wisdom [i.e., the knowledge of what to say], which none of your opponents will be able to resist or speak against.
Acts 6:10
But they could not stand up to the wisdom and [power of] the Holy Spirit by which Stephen spoke.