It wasnarrated that Ibn 'Abbas said:
"Your Prophet (ﷺ) wasenjoinedto do fifty prayers but he returned to your Lord to make(i.e.,reduce) them to five prayers." (JA)
English reference (JA): Vol. 1, Book 5, Hadith 1400 (JA)
Arabic reference (JA): Book 5, Hadith 1464 (JA)