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.

Ephesians 6:19

And [also pray] for me to be given boldness of speech in opening my mouth to make known the secret plan 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 [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.
Ephesians 6:19
And [also pray] for me to be given boldness of speech in opening my mouth to make known the secret plan of the Gospel,