Numbers 23:19

19 aGod is not man, that he should lie,
or a son of man, that he should change his mind.
Has he said, and will he not do it?
Or has he spoken, and will he not fulfill it?

Isaiah 45:19

19 bI did not speak in secret,
in a land of darkness;
I did not say to the offspring of Jacob,
cSeek me in vain.’
Hebrew  in emptiness

I the Lord speak ethe truth;
I declare what is right.

Isaiah 55:11

11so shall my word be that goes out from my mouth;
it shall not return to me empty,
but fit shall accomplish that which I purpose,
and shall succeed in the thing for which I sent it.
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