Matthew 10:19-20

but when they take you up, be not sollicitous how, or what ye shall say; for ye shall be taught in that very instant what ye shall speak: for it is not you that speak,

Luke 12:11-12

And when they bring you before the synagogues, and magistrates, and powers, be not solicitous how or what defence to make, or what to say:

Luke 21:14-15

Fix it therefore in your hearts not to premeditate a defence: for I will give you a mouth and wisdom,

2 Corinthians 8:16

But thanks be to God, who put the same concern for you into the heart of Titus:

Philippians 2:13

for it is God that worketh in you both to will, and to work, out of his own good-pleasure.

James 1:16-18

Be not therefore deceived, my beloved brethren: for every good gift,

Treasury of Scripture Knowledge

Summary

The preparations of the heart in man, and the answer of the tongue, is from the LORD.

Bible References

Preparations

2 Corinthians 8:16
But thanks be to God, who put the same concern for you into the heart of Titus:
Philippians 2:13
for it is God that worketh in you both to will, and to work, out of his own good-pleasure.
James 1:16
Be not therefore deceived, my beloved brethren: for every good gift,

And

Matthew 10:19
but when they take you up, be not sollicitous how, or what ye shall say; for ye shall be taught in that very instant what ye shall speak: for it is not you that speak,
Luke 12:11
And when they bring you before the synagogues, and magistrates, and powers, be not solicitous how or what defence to make, or what to say:
Luke 21:14
Fix it therefore in your hearts not to premeditate a defence: for I will give you a mouth and wisdom,