Galatians 1:20

With respect to the things which I now write to you, behold, before God I lie not.

Romans 9:1

I speak the truth in Christ, I lie not, my conscience bearing me testimony in the Holy Spirit,

2 Corinthians 11:31

The God and Father of our Lord Jesus Christ, who is blessed for ever, knows that I do not lie.

2 Corinthians 11:10-11

As the truth of Christ is in me, this boasting shall not be silenced, in my case, 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
I speak the truth in Christ, I lie not, my conscience bearing me testimony in the Holy Spirit,
2 Corinthians 11:10
As the truth of Christ is in me, this boasting shall not be silenced, in my case, in the regions of Achaia.