Read 1 Kings 13 today.

(Side note: If you did not read 1 Kings 12, I recommend you do so. It is a critical chapter in understanding much of what follows in the history of Israel because of the division between the northern and southern tribes.)
Chapter 13 is one of those chapters that causes many of us to scratch our heads with wonder. It seems like something is wrong because the prophet from Judah is the good guy. He seeks to be obedient to God, yet when he is deceived by another, he is the one who pays the price.
There are a couple of points here. The first is that the death of the prophet from Judah is proof that he is a true prophet (especially to the old man from Bethel). While it seems harsh, as a true prophet, it is nothing less than what he would have expected. He was committed to radical obedience to God, whatever the price.
Second, it seems amazingly unfair that the prophet from Judah would pay the price with his life for the deceit/sin of someone else. Yet, this is also what Christ has done for us.
May we remember that radical obedience to God includes a cost; and that the sin of one person has an impact on others.
1 Kings 13:16-24 NIV
The man of God said, “I cannot turn back and go with you, nor can I eat bread or drink water with you in this place. [17] I have been told by the word of the Lord: ‘You must not eat bread or drink water there or return by the way you came.’ ”
[18] The old prophet answered, “I too am a prophet, as you are. And an angel said to me by the word of the Lord: ‘Bring him back with you to your house so that he may eat bread and drink water.’ ” (But he was lying to him.) [19] So the man of God returned with him and ate and drank in his house.
[20] While they were sitting at the table, the word of the Lord came to the old prophet who had brought him back. [21] He cried out to the man of God who had come from Judah, “This is what the Lord says: ‘You have defied the word of the Lord and have not kept the command the Lord your God gave you. [22] You came back and ate bread and drank water in the place where he told you not to eat or drink. Therefore your body will not be buried in the tomb of your ancestors.’ ”
[23] When the man of God had finished eating and drinking, the prophet who had brought him back saddled his donkey for him. [24] As he went on his way, a lion met him on the road and killed him, and his body was left lying on the road, with both the donkey and the lion standing beside it.