It wasnarrated that Ibn 'Abbas said:
"Allah enjoined the prayer uponthe tongue of your Prophet (ﷺ): Four Rak'ah while a resident andtwoRak'ah when traveling." (JA)
English reference (JA): Vol. 1, Book 5, Hadith 1068 (JA)
Arabic reference (JA): Book 5, Hadith 1121 (JA)