Musannaf Ibn Abi Shayba 9:1796

Abu Bakr narrated to us, he said: Marwan bin Mu'awiyah narrated to us, from Ibn 'Awn, from Muhammad bin Sirin, he said: Umar bin al-Khattab said: "Nothing remains of the morals of the Jahiliyyah (pre-Islamic era) except that I do not care which of the Muslims I marry, and which of them I give in marriage."