Musannaf Ibn Abi Shayba 27:752

Al-Fadl ibn Dukayn narrated to us, from Sufyan, from Habib ibn Abi Thabit, from al-Qasim ibn al-Harith, from Ubayd Allah ibn Utbah, from Abu Mas’ud, who said: The Messenger of Allah (may Allah bless him and grant him peace) said to Quraysh: "Indeed, this matter is among you, and you are its guardians."