Musnad Ahmad 32:2103

'Affan narrated to us, Hammad narrated to us, from Thabit, from Anas, who said: We used to say that the Hour will not be established until the sky rains, but the earth does not grow anything, and until there is one guardian for fifty women, and until a woman passes by a sandal and looks at it, and says: "This once belonged to a man." Hammad mentioned it once like this, and he has mentioned it from Thabit, from Anas, from the Prophet (peace and blessings of Allah be upon him), without doubt in it. And he also said: From Anas, from the Prophet (peace and blessings of Allah be upon him), as far as he reckons.