What does the Bible say about Jesus being unchanging?

Hebrews 13:8 powerfully declares, 'Jesus Christ, the same yesterday, and today, and forever.' This verse underscores the eternal constancy of Christ, assuring believers that His nature, promises, and salvific work remain unchanged throughout time. Unlike humans, who can change for better or worse, Jesus, being fully divine and perfect, does not change. This principle is foundational in Reformed theology, highlighting the assurance and comfort we find in a Savior who is eternally the same, which is crucial for our faith and security in Him.