Numbers 23:19 in the World English Bible
God is not a man, that he should lie, nor a son of man, that he should repent. Has he said, and he won’t do it? Or has he spoken, and he won’t make it good?
Context
18 And he took up his parable, and said, Rise up, Balak, and hear; hearken unto me, thou son of Zippor:
19 God is not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do it? or hath he spoken, and shall he not make it good?
20 Behold, I have received commandment to bless: and he hath blessed; and I cannot reverse it.