New Living Translation
With Christ as my witness, I speak with utter truthfulness. My conscience and the Holy Spirit confirm it.

American Standard Version
I say the truth in Christ, I lie not, my conscience bearing witness with me in the Holy Spirit,

Berean Study Bible
I speak the truth in Christ; I am not lying, as confirmed by my conscience in the Holy Spirit.

Douay-Rheims Bible
I SPEAK the truth in Christ, I lie not, my conscience bearing me witness in the Holy Ghost:

English Revised Version
I say the truth in Christ, I lie not, my conscience bearing witness with me in the Holy Ghost,

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

World English Bible
I tell the truth in Christ. I am not lying, my conscience testifying with me in the Holy Spirit,

Young's Literal Translation
Truth I say in Christ, I lie not, my conscience bearing testimony with me in the Holy Spirit,

Romans 9:1 Additional Translations ...