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.

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 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.