Musannaf Ibn Abi Shayba 16:676

Abu Bakr narrated to us, he said: Al-Hasan ibn Musa narrated to us, from Shayban, from Qatadah, from Abu Burdah, from his father, who said: He said to me: "O my son, if you had witnessed us while we were with the Messenger of Allah, may Allah bless him and grant him peace, when the rain fell upon us, you would have thought that our scent was the scent of sheep."