Mukhtasar Muslim

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.”