Musannaf Ibn Abi Shayba 37:206

Yahya ibn Abi Bukayr narrated to us, he said: Zuhayr ibn Muhammad narrated to us, from Musa ibn Jubayr, from Bishr ibn al-Muharrar, from Abu Dharr, who said: The time is near when no food will be carried to Medina on a camel saddle, and the food of its people will be [only] what one has of property, or cultivation, or livestock, following their tails in the edges of the clouds. So when you see that the buildings have risen above [Mount] Sal’, then abandon it.