Narrated 'Abdur-Rahman bin 'Auf (RA): The Prophet ( صلی اللہ علیہ وسلم ) prostrated and prolonged the Sajda, he then raised his head and said, "Jibrael (Gabriel) had come and given me glad tidings, thereafter I prostrated in gratitude to Allah." [Ahmad reported it and al-Hakim graded it Sahih (authentic)] .