450-1600

The following is reported from in the Musnad of Ahmad Ibn Hanbal from Hafsa, the wife of the Prophet (pbuh):
“There are four things that the Messenger of Allah (pbuh) never abandoned:
Fasting on the day of Ashura, fasting three days every month, fasting ten days
in the month of Dhul-hijjah and performing two rak'ahs before the morning
prayer. Kutub as-Sitta