Musnad Ahmad 31:147

Yunus narrated to us, Fulayh narrated to us, from Salim Abu al-Nadr, from Ubayd ibn Hunayn and Busr ibn Sa'id, from Abu Sa'id al-Khudri, who said: The Messenger of Allah, peace and blessings of Allah be upon him, delivered a sermon, and he mentioned the hadith.