Umm al-Mu’minin Aisha Siddiqa (may Allah be pleased with her) says: Two persons came to the Messenger of Allah (peace and blessings be upon him), and I do not know what they talked about with him, but he became angry and cursed them and spoke ill of them. When they went out, I said,“O Messenger of Allah! They will not benefit from anything.”The Messenger of Allah (peace and blessings be upon him) said,“Why?”I said,“Because you cursed them and spoke ill of them.”The Messenger of Allah (peace and blessings be upon him) said,“Do you not know what I have stipulated with my Lord? I have said: O my Lord! I am a human being, so for any Muslim whom I curse or speak ill of, make it a purification and a reward for him.”