Musnad Ahmad 1107:1

I read to Abd al-Rahman: Malik, from Yazid ibn Abdullah ibn al-Had, from Muhammad ibn Ibrahim ibn al-Harith al-Taymi, from Abu Salamah ibn Abd al-Rahman, from Abu Hurayrah, and he mentioned the hadith. Abu Hurayrah said: I met Busr ibn Abi Busr al-Ghifari. He said: "Where have you come from?" I said: "From al-Tur." He said: "Had I caught up with you before you set out for it, you would not have set out for it. I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'Mounts are not to be saddled except to three mosques: to the Sacred Mosque, to my mosque, and to the mosque of Iliya or Bayt al-Maqdis.'" (He was in doubt).