Musnad Ahmad 937:2

Mu'awiyah ibn 'Amr narrated to us, Za'idah narrated to us, from al-A'mash, from 'Amr ibn Murrah, from 'Abdullah ibn al-Harith al-Bakri, from Habib ibn Hammaz, from Abu Dharr, who said: We were with the Messenger of Allah, may Allah bless him and grant him peace, and he mentioned its meaning.