It wasnarrated that Ibn 'Abbas and Ibn 'Umar said:
"The Messenger ofAllah (ﷺ) prescribed two Rak'ah of prayer when traveling; theyarecomplete and are not shortened. And Witr when traveling isSunnah."
English reference: Vol. 1, Book 5, Hadith 1194
Arabic reference: Book 5, Hadith 1250