Musannaf Ibn Abi Shayba 9:1531

Abu Mu’awiyah narrated to us, from Musa bin Ubayd [al-Rabadhi], from Abdullah bin Khirash, who said: I saw Abu Dharr in al-Rabadha, and with him was a wife of his, dark-skinned or swarthy. He was in a black tent of his. It was said to him, "O Abu Dharr, if only you had taken a wife of higher status than this one." He said, "By Allah, that I should take a wife who humbles me is more beloved to me than that I should take a wife who elevates me."