Musannaf Ibn Abi Shayba 33:161

Abu Mu’awiyah, Ibn Numayr, and Waki’ narrated to us, from al-A’mash, from al-Ma’rur ibn Suwayd, from Abu Dharr, who said: I arrived at the Prophet, may Allah bless him and grant him peace, while he was sitting in the shade of the Kaaba. When he saw me, he said, "They are the greatest losers, by the Lord of the Kaaba." I came and sat down, but I could not remain still, so I stood up and said, "O Messenger of Allah, may my father and mother be sacrificed for you, who are they?" He said, "They are those with the most wealth, except for the one who says with his wealth like this and like this—in front of him, behind him, to his right, and to his left."