Musnad Ahmad 30:678

Ibrahim ibn Khalid narrated to us, Rabah narrated to me, from Ma'mar, from al-Zuhri, Abu Salamah ibn 'Abd al-Rahman informed me, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There will be tribulations, in which the one who is sitting is better than the one who is standing, and the one who is standing is better than the one who is walking, and the one who is walking is better than the one who is running. Whoever finds a refuge or a shelter, let him seek protection in it."