Narrated Sahl ibn Uthman: 'Uqbah ibn Khalid narrated to us, from 'Ubaydullah, from Abu al-Zinad, from Abd al-Rahman al-A'raj, from Abu Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, said: "The Euphrates will soon uncover a mountain of gold, so whoever is present at that time should not take anything from it."