'Truthful' in the Bible

So they sent to Him their disciples together with the Herodians; who said, "Teacher, we know that you are truthful and that you faithfully teach God's truth; and that no fear of man misleads you, for you are not biased by men's wealth or rank.

So they came to Him. "Rabbi," they said, "we know that you are a truthful man and you do not fear any one; for you do not recognize human distinctions, but teach God's way truly. Is it allowable to pay poll-tax to Caesar, or not?

and from Jesus Christ, the truthful witness, the first of the dead to be born to Life, and the Ruler of the kings of the earth. To Him who loves us and has freed us from our sins with His own blood,