"On the Night of Isra, fifty prayers were made obligatory upon the Prophet. Then it was decreased until it was made five. Then it was called out: 'O Muhammad! Indeed My Word does not change; these five prayers will be recorded for you as fifty.'"
Reference: Jami` at-Tirmidhi 213 In-book : Book 2, Hadith 65 English translation : Vol. 1, Book 2, Hadith 213
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