Luke 21:15

for I will give you a mouth and wisdom, which all your adversaries shall be utterly unable to contradict or resist.

Ephesians 6:19

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

Treasury of Scripture Knowledge

Summary

In that day shall thy mouth be opened to him which is escaped, and thou shalt speak, and be no more dumb: and thou shalt be a sign unto them; and they shall know that I am the LORD.

Bible References

Thy

Luke 21:15
for I will give you a mouth and wisdom, which all your adversaries shall be utterly unable to contradict or resist.
Ephesians 6:19
and for me that there may be given unto me utterance to open my mouth with boldness, to make known the mystery of the gospel,