Musannaf Ibn Abi Shayba 28:1105

Yazid ibn Harun narrated to us, he said: Shu'bah informed us, from Abu Ishaq, from al-Rabi' ibn al-Bara', from his father, from the Prophet, may Allah bless him and grant him peace, that when he returned from a journey, he would say: "Returning, repenting, to our Lord praising."