Sayyiduna Qays bin al-Harith al-Asadi (may Allah be pleased with him) (or: al-Harith bin Qays) said: I accepted Islam while I had eight wives, and the Messenger of Allah (peace and blessings be upon him) said to me: "Choose four of them."
Hadith Referenceالمعجم الكبير للطبراني / باب القاف / 16013