Romans 3:7 If, for instance, a falsehood of mine has made God's truthfulness more conspicuous, redounding to His glory, why am I judged all the same as a sinner? (WEY RSV NIV)
Romans 15:8 My meaning is that Christ has become a servant to the people of Israel in vindication of God's truthfulness-- in showing how sure are the promises made to our forefathers-- (WEY RSV)
Isaiah 59:4 none calleth for justice, none pleadeth in truthfulness. They trust in vanity, and speak falsehood; they conceive mischief, and bring forth iniquity. (DBY)