Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said to me: O Ali! Shall I not teach you such words that when you recite them, you will be forgiven, even though forgiveness has already been decreed for you? (Those words are:) "There is no deity except Allah, Who is Most High and Most Great. There is no deity except Allah, Who is Forbearing and Clement. Allah is free from all defects, Who is the Lord of the seven heavens and the Mighty Throne. And all praise is due to Allah, the Lord of all the worlds."
Hadith Referenceصحیح ابن حبان / كتاب إخباره ﷺ عن مناقب الصحابة رجالهم ونسائهم بذكر أسمائهم رضوان الله عليهم أجمعين / 6928
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح لغيره - «الروض النضير» (679 و 717).فضيلة الشيخ العلّامة شُعيب الأرناؤوطحديث صحيح