Musnad Ahmad 1013:60

Yunus narrated to us, Al-Attaf ibn Khalid narrated to us, Abu Hazim narrated to us, from Sahl ibn Sa’d, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "A morning journey in the cause of Allah is better than the world and what is in it. And an evening journey in the cause of Allah is better than the world and what is in it. And the space of a whip in Paradise is better than the world and what is in it."