Remembrance 3 from Chapter 173
What to say when mounting an animal
Allāhu akbar (x3).
Subḥāna-lladhī sakhkhara lanā hādhā wa mā kunnā lahu muqrinīn wa innā ilā Rabbinā la-munqalibūn. Allāhumma innā nas’aluka fī safarinā hādha-l-birra wa-t-taqwā, wa mina-l-‘amali mā tarḍā. Allāhumma hawwin ‘alaynā safaranā hādhā, wa-ṭwi ‘annā bu‘dah. Allāhumma Anta-ṣ-Ṣāḥibu fi-s-safari wa-l-Khalīfatu fi-l-ahl. Allāhumma innī a‘ūdhu bika min wa‘thā’i-s-safar, wa ka’ābati-l-manẓari wa sū’i-l-munqalabi fi-l-māli wa-l-ahl.
Ā’ibūna tā’ibūna ‘ābidūn, li-Rabbinā ḥāmidūn.
We relate in the Ṣaḥīḥ of Muslim (in the Chapter on Ḥajj) that ‘Abdullāh ibn ‘Umar 
reported that when the Messenger of Allah 
straightened up on his camel when setting out on a journey he said: “Allah is greater” thrice. Then he said: “Glory be to Him Who has subjugated this to us, for we could not have accomplished it, and truly to our Lord we are returning. O Allah, we ask You for piety and fear of Allah and deeds with which You will be pleased on this journey of ours. O Allah, make this journey easy for us and fold up for us its distance. O Allah, You are the Companion on the journey and the Deputy among the family. O Allah, I seek Your protection from discomfort on the journey and from a gloomy outlook, and from any evil befalling my wealth or family.” When one returns one should say the same and add: Returning, repenting, worshipping, praising our Lord. [3].The wording is from Muslim’s version.