Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) used to fast during the first three days of every month, and he (peace and blessings be upon him) would rarely break his fast on Fridays.
Hadith Referenceالفتح الربانی / كتاب الصيام / 3962
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«اسناده حسن۔ اخرجه ابوداود: 2450، وابن ماجه: 1725، والترمذي: 742، (انظر مسند أحمد ترقيم الرسالة: 3860 ترقیم بيت الأفكار الدولية: 3860»
Brief Explanation
Benefits: … This will be interpreted regarding Friday that the Prophet sallallahu alayhi wa sallam would fast either before or after it as well, because he sallallahu alayhi wa sallam only prohibited fasting solely on Friday. Fasting three days at the very beginning of the month—this is what eagerness for virtue demands. Various verses and hadiths have encouraged that a person should fulfill his responsibilities promptly, because one does not know when preoccupation, death, or illness may occur.