Musnad Ahmad 937:41

Muhammad ibn Fudayl narrated to us, Salim—meaning Ibn Abi Hafsah—narrated to us, from Salim ibn Abi al-Ja’d, from Abu Dharr; and Mansur, from Zayd ibn Wahb, from Abu Dharr, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said to me: "O Abu Dharr, which mountain is this?" I said: "Uhud, O Messenger of Allah." He said: "By the One in Whose hand is my soul, it would not please me that it were gold for me, in pieces, which I would spend in the way of Allah, while leaving behind a qirat of it." I said: "A qintar, O Messenger of Allah?" He said: "A qirat." He said it three times. Then he said: "O Abu Dharr, I am only saying that which is less, and I am not saying that which is more."