´'Abdul-Malik bin Abi Al-Minhai narrated from his father that:` the Prophet commanded them to fast the three days of Al-Bid. He said: "That is (equivalent to) fasting for the whole month."
Hadith ReferenceSunan an-Nasa'i / The Book of Fasting / Hadith: 2433
Hadith Gradingالألبانی:ضعيف | زبیر علی زئی:ضعيف، إسناده ضعيف، انظر الحديث السابق (2432) انوار الصحيفه، صفحه نمبر 339