Why was a prophet from Judah killed by a lion after prophesying against the altar in Bethel?

ANSWER

For eating bread and drinking water at a forbidden time.

1st Kings 13 :

(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. (25) Some people who passed by saw the body lying there, with the lion standing beside the body, and they went and reported it in the city where the old prophet lived.

(26) When the prophet who had brought him back from his journey heard of it, he said, “It is the man of God who defied the word of the LORD. The LORD has given him over to the lion, which has mauled him and killed him, as the word of the LORD had warned him.”
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