Numbers 23:19; Titus 1:2; Hebrews 6:18

Numbers 23:19

19 "God is not a man, that He should lie, Nor a son of man, that He should repent; Has He said, and will He not do it? Or has He spoken, and will He not make it good

Titus 1:2

2 in the hope of eternal life, which God, who cannot lie, promised long ages ago,

Hebrews 6:18

18 so that by two unchangeable things in which it is impossible for God to lie, we who have taken refuge would have strong encouragement to take hold of the hope set before us.