Mark 13:11

When they arrest you and hand you over, do not worry beforehand about what you are to say, but say whatever is given you in that hour; for it is not you who speak, but it is the Holy Spirit.

Matthew 10:19-21

But when they hand you over, do not worry about how or what you are to say; for it will be given you in that hour what you are to say.

Luke 12:11-12

When they bring you before the synagogues and the rulers and the authorities, do not worry about how or what you are to speak in your defense, or what you are to say;

Luke 21:14-15

So make up your minds not to prepare beforehand to defend yourselves;

Acts 6:10

But they were unable to cope with the wisdom and the Spirit with which he was speaking.

Exodus 4:10-12

Then Moses said to the Lord, “Please, Lord, I have never been eloquent, neither recently nor in time past, nor since You have spoken to Your servant; for I am slow of speech and slow of tongue.”

2 Samuel 23:2

The Spirit of the Lord spoke by me,
And His word was on my tongue.

Isaiah 50:4

The Lord God has given Me the tongue of disciples,
That I may know how to sustain the weary one with a word.
He awakens Me morning by morning,
He awakens My ear to listen as a disciple.

Jeremiah 1:6-9

Then I said, “Alas, Lord God!
Behold, I do not know how to speak,
Because I am a youth.”

Daniel 3:16-18

Shadrach, Meshach and Abed-nego replied to the king, “O Nebuchadnezzar, we do not need to give you an answer concerning this matter.

Matthew 10:17

But beware of men, for they will hand you over to the courts and scourge you in their synagogues;

Mark 13:9

“But be on your guard; for they will deliver you to the courts, and you will be flogged in the synagogues, and you will stand before governors and kings for My sake, as a testimony to them.

John 3:27

John answered and said, “A man can receive nothing unless it has been given him from heaven.

Acts 2:4

And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit was giving them utterance.

Acts 3:13

The God of Abraham, Isaac and Jacob, the God of our fathers, has glorified His servant Jesus, the one whom you delivered and disowned in the presence of Pilate, when he had decided to release Him.

Acts 4:8-22

Then Peter, filled with the Holy Spirit, said to them, “Rulers and elders of the people,

Acts 4:31

And when they had prayed, the place where they had gathered together was shaken, and they were all filled with the Holy Spirit and began to speak the word of God with boldness.

Acts 6:15

And fixing their gaze on him, all who were sitting in the Council saw his face like the face of an angel.

Acts 7:55

But being full of the Holy Spirit, he gazed intently into heaven and saw the glory of God, and Jesus standing at the right hand of God;

1 Corinthians 2:13

which things we also speak, not in words taught by human wisdom, but in those taught by the Spirit, combining spiritual thoughts with spiritual words.

Ephesians 3:5

which in other generations was not made known to the sons of men, as it has now been revealed to His holy apostles and prophets in the Spirit;

Ephesians 6:19-20

and pray on my behalf, that utterance may be given to me in the opening of my mouth, to make known with boldness the mystery of the gospel,

James 1:5

But if any of you lacks wisdom, let him ask of God, who gives to all generously and without reproach, and it will be given to him.

1 Peter 1:12

It was revealed to them that they were not serving themselves, but you, in these things which now have been announced to you through those who preached the gospel to you by the Holy Spirit sent from heaven—things into which angels long to look.

Treasury of Scripture Knowledge

Summary

But when they shall lead you, and deliver you up, take no thought beforehand what ye shall speak, neither do ye premeditate: but whatsoever shall be given you in that hour, that speak ye: for it is not ye that speak, but the Holy Ghost.

General references

Bible References

And deliver

Mark 13:9
“But be on your guard; for they will deliver you to the courts, and you will be flogged in the synagogues, and you will stand before governors and kings for My sake, as a testimony to them.
Matthew 10:17
But beware of men, for they will hand you over to the courts and scourge you in their synagogues;
Acts 3:13
The God of Abraham, Isaac and Jacob, the God of our fathers, has glorified His servant Jesus, the one whom you delivered and disowned in the presence of Pilate, when he had decided to release Him.

Shall be

Isaiah 50:4
The Lord God has given Me the tongue of disciples,
That I may know how to sustain the weary one with a word.
He awakens Me morning by morning,
He awakens My ear to listen as a disciple.
John 3:27
John answered and said, “A man can receive nothing unless it has been given him from heaven.
Ephesians 6:19
and pray on my behalf, that utterance may be given to me in the opening of my mouth, to make known with boldness the mystery of the gospel,
James 1:5
But if any of you lacks wisdom, let him ask of God, who gives to all generously and without reproach, and it will be given to him.

But

2 Samuel 23:2
The Spirit of the Lord spoke by me,
And His word was on my tongue.
1 Corinthians 2:13
which things we also speak, not in words taught by human wisdom, but in those taught by the Spirit, combining spiritual thoughts with spiritual words.
Ephesians 3:5
which in other generations was not made known to the sons of men, as it has now been revealed to His holy apostles and prophets in the Spirit;
1 Peter 1:12
It was revealed to them that they were not serving themselves, but you, in these things which now have been announced to you through those who preached the gospel to you by the Holy Spirit sent from heaven—things into which angels long to look.

General references

Exodus 4:12
Now then go, and I, even I, will be with your mouth, and teach you what you are to say.”
Luke 12:11
When they bring you before the synagogues and the rulers and the authorities, do not worry about how or what you are to speak in your defense, or what you are to say;
Luke 21:14
So make up your minds not to prepare beforehand to defend yourselves;