It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them) that he said: When the Prophet (peace and blessings of Allah be upon him) would visit a sick person, he would sit by his head and then recite this supplication seven times: «أسأل الله العظيم رب العرش العظيم أن يشفيك» "I ask Allah, the Lord of the Magnificent Throne, to cure you." If his death was to be delayed, he would recover from that illness.
Hadith Referenceالادب المفرد / كتاب / 536
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه أبوداؤد ، كتاب الجنائز ، باب الدعاء للمريض عند العيادة : 3106 و الترمذي : 2083»
It is narrated from Rabi' bin Abdullah (may Allah have mercy on him) that I went with Hasan (may Allah have mercy on him) to visit Qatadah (may Allah have mercy on him) during his illness. He sat by his bedside and inquired about his condition, then prayed for him in these words: O Allah, heal his heart and grant him health from his illness.
Hadith Referenceالادب المفرد / كتاب / 537
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : كذا الأصل ، و فى تهذيب الكمال : 96/9 و فى ترجمة الربيع بن عبد الله هذا و هو ابن خطاف الأحدب»