Husayn (may Allah have mercy on him) narrated: A beggar asked (for something) while Sayyiduna Ibn Abbas (may Allah be pleased with them both) was in prayer. So Sayyiduna Ibn Abbas (may Allah be pleased with them both) said to him: O beggar! He said: Labbayk (at your service). He asked: Do you bear witness that there is no true god except Allah? He said: Yes. He asked: And do you pray the five prayers? He said: Yes. He asked: And do you fast Ramadan? He said: Yes. He said: Then it is a duty upon us to treat you kindly. So he took off a garment he was wearing and clothed him with it, then on that occasion he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Any Muslim who clothes a Muslim with a garment remains in the protection of Allah as long as even a patch of it remains on him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12538