Sayyidah Aishah (may Allah be pleased with her) said: Two men came in to the Prophet (peace and blessings be upon him) and he was displeased with them. I said: O Messenger of Allah, everyone receives good from you, but these two have not received any good from you. He (peace and blessings be upon him) said: "Do you not know what covenant I have made with my Lord?" I said: What covenant have you made? He (peace and blessings be upon him) said: "I said: O Allah, whichever believer I revile or curse, make it for him a means of forgiveness and well-being."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13383