Musannaf Ibn Abi Shayba 3:4492

Waki’ narrated to us, he said: Sharik narrated to us, from ‘Ammar bin Mu’awiyah al-Duhni, from Salim bin Abi al-Ja’d, from Hudhayfah, he said: "The Witr is only for the people of the Qur’an."