Musnad Ahmad 830:40

Waki’ narrated to us, Uthman al-Shahham narrated to us, he said: Muslim ibn Abi Bakrah narrated to me, from his father, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There will be a tribulation; the one lying down during it is better than the one sitting, and the one sitting is better than the one standing, and the one standing during it is better than the one walking, and the one walking is better than the one running." A man said: "O Messenger of Allah, what do you command me to do?" He said: "Whoever has camels, let him join his camels; and whoever has sheep, let him join his sheep; and whoever has land, let him join his land." The man said: "And whoever does not have any of that?" He said: "Let him take his sword, strike its edge against a rock, then let him escape if he is able to escape, then let him escape if he is able to escape."