Hadith about the White Days

Three days per month

ʿAbdullāh ibn ʿAmr narrated that the Prophet ﷺ said: “Fasting three days of every month is like fasting for a lifetime.” ^[1]Bukhari & Muslim

The reward multiplied tenfold

The Prophet ﷺ explained: “Every good deed is rewarded tenfold. So fasting three days per month is like fasting for a lifetime.” ^[2]Muslim

The White Days mentioned explicitly

Abū Dharr narrated that the Prophet ﷺ said: “The Messenger of Allah commanded us to fast three days: the White Days — the 13th, 14th, and 15th.” ^[3]al-Nasā’ī, Ibn Mājah

The advice to Abū al-Dardāʾ and Abū Hurayrah

Both Companions narrated that the Prophet ﷺ advised them to fast three days every month, pray Duḥā, and perform Witr before sleeping. ^[4]Bukhari & Muslim

Summary

All these hadith emphasize fasting at least three days each month, with many scholars agreeing they are the White Days. Read the full explanation here.