Al-Hasan said Abu Huraira told him that God's messenger said, "The sun and the moon are two oxen which will be cast away into hell on the day of resurrection." Al-Hasan asked what sin they had committed, and on receiving the reply, "I am telling you on the authority of God's messenger," al-Hasan said no more.
Baihaqi transmitted it in Kitab al-ba'th wan nushur.