1 Kings 13:16
And he said, I may not return with thee, nor go in with thee: neither will I eat bread nor drink water with thee in this place: And he said, I may not return with thee, nor go in with thee: neither will I eat bread nor drink water with thee in this place:
The man from Judah had been given a clear order from the Lord not to turn back with anyone who invited him, not to go in or enter a house, and not to eat bread or drink water in that place at Bethel. In saying these words he was bravely and rightly refusing King Jeroboam's invitation and promised reward. He repeated the same faithful refusal when the old prophet urged him to turn back and eat and drink with him, correctly stating and holding to the instruction the Lord had given.
Afterward he disobeyed and let himself be persuaded to turn back by the old prophet, a professed fellow prophet who is a false prophet, on the claim that an angel had brought a contrary message. That claim was a framed lie, and God had not spoken through him. The lesson is to obey God's stated direction rather than accept a contrary claim of divine authority even from one who says he is a prophet, for it is dangerous to accept what contradicts a clear word from God. He should have stayed faithful to the instruction he had received, held to his purpose, and continued on his way toward Judah.
His leaving the path of duty cost him his life, and that judgment confirmed the truth of the prophecy and warned Jeroboam against persisting in disobedience. The story of the disobedient prophet in this chapter does not by itself prove that one who bears prophetic testimony is a false prophet, so to use it to dismiss such a person as a deceived prophet is an evasion unless disobedience to God can be shown.