Galatians 1:20

And the things that I write to you, lo, before God -- I lie not;

Romans 9:1

Truth I say in Christ, I lie not, my conscience bearing testimony with me in the Holy Spirit,

2 Corinthians 11:31

the God and Father of our Lord Jesus Christ -- who is blessed to the ages -- hath known that I do not lie! --

2 Corinthians 11:10-11

The truth of Christ is in me, because this boasting shall not be stopped in regard to me in the regions of Achaia;

Treasury of Scripture Knowledge

Summary

Now the things which I write unto you, behold, before God, I lie not.

Bible References

Behold

Romans 9:1
Truth I say in Christ, I lie not, my conscience bearing testimony with me in the Holy Spirit,
2 Corinthians 11:10
The truth of Christ is in me, because this boasting shall not be stopped in regard to me in the regions of Achaia;