Musnad Ahmad 937:175

Abu Dawud narrated to us, Shu'bah narrated to us, Habib ibn Abi Thabit, and 'Abd al-'Aziz ibn Rufay', and al-A'mash informed me—all of them heard Zayd ibn Wahb narrating from Abu Dharr, from the Prophet, may Allah bless him and grant him peace, that he said: "Whoever dies not associating anything with Allah shall enter Paradise."