"Cannot err"

1. 2 Ne. 25: 20
   20 And now, my brethren, I have spoken plainly that ye cannot err. And as the Lord God liveth that brought Israel up out of the land of Egypt, and gave unto Moses power that he should heal the nations after they had been bitten by the poisonous serpents, if they would cast their eyes unto the serpent which he did raise up before them, and also gave him power that he should smite the rock and the water should come forth; yea, behold I say unto you, that as these things are true, and as the Lord God liveth, there is none other name given under heaven save it be this Jesus Christ, of which I have spoken, whereby man can be saved.
2. Alma 5: 43
   43 And now, my brethren, I would that ye should hear me, for I speak in the energy of my soul; for behold, I have spoken unto you plainly that ye cannot err, or have spoken according to the commandments of God.
3. Alma 13: 23
   23 And they are made known unto us in plain terms, that we may understand, that we cannot err; and this because of our being wanderers in a strange land; therefore, we are thus highly favored, for we have these glad tidings declared unto us in all parts of our vineyard.