Here Is a Yid
It is told that Rav Yaakov Yitzchok of Peshischa, the Yid Hakadosh, once saw a farmer standing and holding his horse, and he recognized that it was Eliyahu Hanavi in the form of a farmer. He said to his servant, "Look, there is Eliyahu Hanavi."
Eliyahu Hanavi turned to him and said, "Look, here is a Yid. Why do you reveal everything that you see?" And then he vanished.