Tractate Berakoth, by , by A. Lukyn Williams, , at sacred-texts.com
Prayer when riding on an Ass.
M.IV. 5. Should one be riding on an ass let him dismount. If he cannot dismount let him turn his face. 2 And if he cannot turn his face let him direct his intention towards the most Holy Sanctuary.
T. III. 18. If a man is riding on his ass, if he has anyone to hold the ass for him let him descend and pray; but if not let him pray where he is. Rabbi says: In either case he prays where he is, only he must direct his intention.
32:2 turn his face. i.e. to Jerusalem and the Temple.
Next: M. IV. 6; T. III. 19. Prayer on a Ship or on a Raft