Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) was asked about the supplication he had made when the Prophet (peace and blessings be upon him) said: "Ask, and you will be given." He said: I said: 'Allahumma inni as'aluka imanan la yartadd, wa na'iman la yanfad, wa murafaqata nabiyyika Muhammadin (peace and blessings be upon him) fi a'la darajil-jannati jannatil-khuld' (O Allah, I ask You for faith that never fades, for a blessing that never ends, and I seek the companionship of Your Prophet Muhammad (peace and blessings be upon him) in the highest ranks of the Garden of Eternity). This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.