Wahb bin Jarir bin Hazim bin Zayd وهب بن جرير بن حازم بن زيد · Fasting (Kitab Al-Siyam)

Eat. He said: I am fasting. 'Amr said: Eat, these are the days on which the Messenger of Allah (ﷺ) used to command us to break fast, and forbid us to keep fast. The narrator Malik said: These are the day of al-tashriq (i.e. 11th, 12th, and 13th of Dhu al-Hijjah).