Bilangan 23:19

23:19 God is not a man, that he should lie,

nor a human being, ¹  that he should change his mind.

Has he said, and will he not do it?

Or has he spoken, and will he not make it happen? ² 

Roma 11:29

11:29 For the gifts and the call of God are irrevocable.

[23:19]  ¹ tn Heb “son of man.”

[23:19]  ² tn The verb is the Hiphil of קוּם (qum, “to cause to rise; to make stand”). The meaning here is more of the sense of fulfilling the promises made.