Romans 1:9
For God is my witness, whom I serve with my spirit in the gospel of his Son, that, without ceasing, I make mention of you,
Romans 9:1
I speak the truth in Christ, I lie not, my conscience bearing me testimony in the Holy Spirit,
2 Corinthians 1:23
But I call on God as a witness against my soul, that wishing to spare you, I did not go to Corinth;
2 Corinthians 11:31
The God and Father of our Lord Jesus Christ, who is blessed for ever, knows that I do not lie.
1 Thessalonians 2:5
For neither nattering words did we at any time use, as you know, nor a pretext for covetousness; God is witness:
1 Thessalonians 2:10
You are witnesses, and God also, in how holy and just and blameless a manner we conducted our selves among you that believe,