Maliks Muwatta Book 20, Hadith Number 135.
Section : Fasting on the Days of Mina.
Yahya related to me from Malik from Abu’n-Nadr, the mawla of Umar ibn Ubaydullah, from Sulayman ibn Yasar that the Messenger of Allah, may Allah bless him and grant him peace, forbade fasting on the days of Mina.