From Sanhedrin 98a
https://www.chabad.org/library/article_cdo/aid/5458622/jewish/98a.htm
Rabbi Yehoshua ben Levi said to Elijah: When will the Messiah come? Elijah said to him: Go ask him. Rabbi Yehoshua ben Levi asked: And where is he sitting? Elijah said to him: At the entrance of the city of Rome. Rabbi Yehoshua ben Levi asked him: And what is his identifying sign by means of which I can recognize him? Elijah answered: He sits among the poor who suffer from illnesses. And all of them untie their bandages and tie them all at once, but the Messiah unties one bandage and ties one at a time. He says: Perhaps I will be needed to serve to bring about the redemption. Therefore, I will never tie more than one bandage, so that I will not be delayed.
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