It is narrated from Hazrat Anas (may Allah be pleased with him) that we were in the house of an Ansari, the Prophet (peace and blessings be upon him) came and stood holding the door panels and said: "There will be leaders from among the Quraysh, and they will have rights over you, and you will have rights over them in the same way. When people ask them for mercy, they should deal mercifully with them; when they make a promise, they should fulfill it; when they judge, they should judge with justice. Whoever does not do so, upon him is the curse of Allah, the angels, and all people."