Musannaf Ibn Abi Shayba 13:2043

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Sufyan narrated to us, from ‘Amr ibn Murrah, from Murrah al-Hamadani, he said: ‘Umar said: "Three things, that the Messenger of Allah (may Allah bless him and grant him peace) had clarified them for us, would be more beloved to me than the world and what is in it: the Caliphate, the Kalalah (inheritance of one who leaves no direct descendants or ascendants), and Riba (usury)."