Romans 9:1

I speak truth in Christ, I do not lie, my conscience bearing witness with me in the Holy Spirit, that

Galatians 1:20

Now as to what I am writing to you, behold, before God, I do not lie.

1 Timothy 2:7

whereunto I was appointed a herald and an apostle, (I speak the truth, I lie not,) a teacher of the gentiles in faith and truth.

Romans 1:9

For God is my witness, whom I serve with my spirit in the gospel of his Son, how constantly I make mention of you, always in my prayers

Romans 8:16

The Spirit itself beareth witness with our spirit, that we are children of God;

2 Corinthians 11:10

As the truth of Christ is in me, this boasting shall not be stopped in regard to me in the regions of Achaia.

2 Corinthians 12:19

Have ye been thinking this long time that we are defending ourselves to you? It is before God in Christ that we are speaking; but all things, beloved, for your edification.

Romans 2:15

since they show that what the Law requireth is written in their hearts, their conscience bearing witness, and their thoughts in turn accusing or defending them;

2 Corinthians 1:12

For our glorying is this, the testimony of our conscience, that in simplicity and the sincerity which is of God, not in fleshly wisdom, but in the grace of God, we have conducted ourselves in the world, and especially toward you.

2 Corinthians 1:23

But I call upon God as a witness against my soul, that it was to spare you that I came no more to Corinth;

2 Corinthians 11:31

The God and Father of the Lord Jesus, who is blessed for evermore, knoweth that I am not lying.

Philippians 1:8

For God is my witness how much I long for you all in the tender affection of Christ Jesus.

1 Thessalonians 2:5

For neither at any time did we use flattering words, as ye know, nor a cloak of covetousness, God is witness;

1 Timothy 1:5

Now the end of the commandment is love, out of a pure heart and a good conscience and faith unfeigned;

1 Timothy 5:21

I charge thee before God and Christ Jesus and the elect angels, that thou observe these things without prejudging, doing nothing with partiality.

1 John 3:19-21

And hereby we know that we are of the truth, and shall assure our hearts before him;

Treasury of Scripture Knowledge

Summary

I say the truth in Christ, I lie not, my conscience also bearing me witness in the Holy Ghost,

General references

Bible References

I say

Romans 1:9
For God is my witness, whom I serve with my spirit in the gospel of his Son, how constantly I make mention of you, always in my prayers
2 Corinthians 1:23
But I call upon God as a witness against my soul, that it was to spare you that I came no more to Corinth;
2 Corinthians 11:31
The God and Father of the Lord Jesus, who is blessed for evermore, knoweth that I am not lying.
2 Corinthians 12:19
Have ye been thinking this long time that we are defending ourselves to you? It is before God in Christ that we are speaking; but all things, beloved, for your edification.
Galatians 1:20
Now as to what I am writing to you, behold, before God, I do not lie.
Philippians 1:8
For God is my witness how much I long for you all in the tender affection of Christ Jesus.
1 Thessalonians 2:5
For neither at any time did we use flattering words, as ye know, nor a cloak of covetousness, God is witness;
1 Timothy 2:7
whereunto I was appointed a herald and an apostle, (I speak the truth, I lie not,) a teacher of the gentiles in faith and truth.
1 Timothy 5:21
I charge thee before God and Christ Jesus and the elect angels, that thou observe these things without prejudging, doing nothing with partiality.

My conscience

Romans 2:15
since they show that what the Law requireth is written in their hearts, their conscience bearing witness, and their thoughts in turn accusing or defending them;
Romans 8:16
The Spirit itself beareth witness with our spirit, that we are children of God;
2 Corinthians 1:12
For our glorying is this, the testimony of our conscience, that in simplicity and the sincerity which is of God, not in fleshly wisdom, but in the grace of God, we have conducted ourselves in the world, and especially toward you.
1 Timothy 1:5
Now the end of the commandment is love, out of a pure heart and a good conscience and faith unfeigned;
1 John 3:19
And hereby we know that we are of the truth, and shall assure our hearts before him;

General references

Acts 24:16
On this ground do I also myself strive to have always a conscience void of offence toward God and toward men.