حَدَّثَنِي مَالِكٌ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ إِذَا وَضَعَ رِجْلَهُ فِي الْغَرْزِ وَهُوَ يُرِيدُ السَّفَرَ يَقُولُ ‏"‏ بِاسْمِ اللَّهِ ‏.‏ اللَّهُمَّ أَنْتَ الصَّاحِبُ فِي السَّفَرِ وَالْخَلِيفَةُ فِي الأَهْلِ اللَّهُمَّ ازْوِ لَنَا الأَرْضَ وَهَوِّنْ عَلَيْنَا السَّفَرَ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ وَعْثَاءِ السَّفَرِ وَمِنْ كَآبَةِ الْمُنْقَلَبِ وَمِنْ سُوءِ الْمَنْظَرِ فِي الْمَالِ وَالأَهْلِ ‏"‏ ‏.‏

Malik related to me that he heard that when the Messenger ofAllah, may Allah bless him and grant him peace, set foot in thestirrup intending to travel, he would say, "In the name of Allah. OAllah! You are my companion in the journey and the Khalifa of myfamily. O Allah! Spread out the earth for us and make the journey easyfor us. O Allah! I seek refuge with You from the hardship of thejourney and from returning to sorrow and a distressing sight regardingproperty and family." Translation Not Available

Book Ref: Muwatta Imam Malik Book 54 Hadith 1799
Web Ref:  Muwatta Imam Malik Book 54 Hadith 34