Who’s Word do you trust

Hebrews 10:23 (NIV) – ²³ Let us hold unswervingly to the hope we profess, for he who promised is faithful.

Numbers 23:19 (NIV) – ¹⁹ 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?