It is narrated from Sayyidah Aishah (may Allah be pleased with her) that Jibril (peace be upon him) came to the Prophet (peace and blessings be upon him) and said: "Allah Almighty commands you to supplicate with these words, and He will certainly grant you one of them: 'Allahumma inni as'aluka ta'jila 'afiyatik, wa sabran 'ala baliyyatik, aw khurujan minad-dunya ila rahmatik' (O Allah, I ask You to hasten Your well-being, I ask You for patience over the trial that comes from You, or I implore You to depart from this world and reach Your mercy)." This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.