Musannaf Ibn Abi Shayba 27:766

Abu Mu'awiyah and Waki' narrated to us, from al-A'mash, from Abu Salih, from Abu Sa'id, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Do not revile my companions, for by the One in Whose hand is my soul, if one of you were to spend the equivalent of Mount Uhud in gold, he would not reach a mudd of one of them, nor half of it."