Musannaf Ibn Abi Shayba 21:486

Abu al-Ahwas narrated to us, from Simak, from Ikrimah, from Ibn Abbas, who said: When the Messenger of Allah (peace be upon him) intended to go out on a journey, he would say: "O Allah, You are the companion in the journey and the successor in the family. O Allah, I seek refuge in You from the hardship of the journey and the gloom of the return. O Allah, shorten the earth for us and make the journey easy for us."