Maliks Muwatta Book 16, Hadith Number 56.

Yahya related to me from Malik that Abu’n Nadr, the mawla of Umar ibn Ubaydullah, said that the Messenger of Allah, may Allah bless him and grant him peace, said, when Uthman ibn Madhun’s funeral procession passed by him, “You have gone and you were not involved in any of it.”