'Untrue' in the Bible

Here I am: give witness against me before the Lord and before the man on whom he has put the holy oil: whose ox or ass have I taken? to whom have I been untrue? who has been crushed down by me? from whose hand have I taken a price for the blinding of my eyes? I will give it all back to you.

And they said, You have never been untrue to us or cruel to us; you have taken nothing from any man.