Nor turn again... — The significance of this command is less obvious. It may have meant that he should not suffer the way of his return (which would clearly not be the obvious way) to be known, but should vanish swiftly, like the messenger of Elisha to Jehu (2 Kings 9:3; 2 Kings 9:10), when his work was done. If so, his neglect of the spirit of the command was the first step in the way of his destruction.
Related Commentaries of 1 Kings 13:9
1 Kings 13:9
9 For so was it charged me by the word of the LORD, saying, Eat no bread, nor drink water, nor turn again by the same way that thou camest.