How do we know that God's word must be followed?

In the case of the prophet in 1 Kings 13, obedience to God's command not to eat in Bethel was critical. The disobedience of the prophet, influenced by the lie of another prophet, led to dire consequences. This emphasizes that God's word is unambiguous and must be adhered to for our spiritual well-being. Throughout scripture, God's directives are clear, underscoring the necessity of following His instructions precisely, as they reveal His character and uphold the honor of Christ who fulfills all righteousness for His people.