Hebrews 6:18

1 Samuel 15:29 NIV
He who is the Glory of Israel does not lie or change his mind; for he is not a human being, that he should change his mind.”

2 Timothy 2:13 NIV
if we are faithless, he remains faithful, for he cannot disown himself.

Numbers 23:19 NIV
God is not human, that he should lie, not a human being, that he should change his mind. Does he speak and then not act? Does he promise and not fulfill?

Titus 1:2 NIV
in the hope of eternal life, which God, who does not lie, promised before the beginning of time,