Adam Clarke on 2 Kings 1:15

And the angel of the Lord said - Go down with him - This is an additional proof that Elijah was then acting under particular inspirations: he had neither will nor design of his own. He waited to know the counsel, declare the will, and obey the command, of his God.

And he arose, and went down - He did not even regard his personal safety or his life; he goes without the least hesitation to the king, though he had reason to suppose he would be doubly irritated by his prediction, and the death of one hundred of his men. But with all these consequences he had nothing to do; he was the ambassador of the King eternal, and his honor and life were in the hands of his Master.