Musannaf Ibn Abi Shayba 36:44

Abu Khalid al-Ahmar narrated to us, from Humayd, from Anas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "When I reached the Lote Tree (Sidrat al-Muntaha), its leaves were like the ears of elephants, and its fruits were like large water jars (qilal). When it was covered by what covered it of the command of Allah, it transformed, and I mentioned rubies."