It is narrated from Sayyiduna Rabi’ah bin Ka’b (may Allah be pleased with him) that I used to spend the night at the door of the house of the Prophet (peace and blessings of Allah be upon him) so that I could provide him with water, etc., for ablution. I would hear the Prophet (peace and blessings of Allah be upon him) saying “Sami’ Allahu liman hamidah” late into the night, and I would hear him reciting “Alhamdu lillahi Rabbil ‘alamin” for a long time.
Hadith Referenceالادب المفرد / كتاب / 1218
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه الترمذي ، كتاب الدعوات : 3416 و النسائي : 1618 و ابن ماجه : 3879 - أنظر صحيح أبى داؤد : 1193»