Musnad Abu Ya'la al-Mawsili 243:46

Narrated to us 'Abd al-Wahid ibn Ghiyath, narrated to us Abu 'Awanah, from Qatadah, from Abu Burdah, from Abu Musa, who said: "O my son, if you had seen us while we were with our Prophet, may Allah bless him and grant him peace, and the rain had afflicted us, you would have thought that our scent was the scent of sheep."