Musnad Abu Ya'la al-Mawsili 219:9

Zuhayr ibn Harb narrated to us, Yazid ibn Harun narrated to us, Muhammad ibn Abdullah al-Shu'aythi informed us, from his father, from 'Anbasah ibn Abi Sufyan, from Umm Habibah, the wife of the Prophet, may Allah bless him and grant him peace, who said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Whoever prays four [rak'ahs] before the Dhuhr [prayer] and four after it, Allah will forbid him to the Fire."