Musnad Ahmad 30:107

'Abd al-Rahman narrated to us, from Malik, from Sumayy, from Abu Salih, from Abu Hurayrah, from the Prophet (peace and blessings of Allah be upon him), who said: "Travel is a piece of torment; it prevents one of you from his food, his drink, and his sleep. So when one of you has fulfilled his need from his travel, let him hasten to his family."