O Allah, You are the Companion on the journey, and the Guardian of the family. — Travel
اللَّهُمَّ أَنْتَ الصَّاحِبُ فِي السَّفَرِ، وَالْخَلِيفَةُ فِي الْأَهْلِ
Transliteration: Allaahumma antas-saahibu fis-safar, wal-khaleefatu fil-ahl
Translation: O Allah, You are the Companion on the journey, and the Guardian of the family.
Reference: Muslim 2:978