"The Messenger of Allah (ﷺ) used to pray on his mount while on a journey, no matter what direction it was facing." Malik said: "Abdullah bin Dinar said: 'And Ibn 'Umar used to do likewise.'"
Reference: Sunan an-Nasa'i 492 In-book : Book 5, Hadith 45 English translation : Vol. 1, Book 5, Hadith 493
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