(70) باب مَنْ قَالَ الاِثْنَيْنِ وَالْخَمِيسِ
Narrated Hafsah, Ummul Mu'minin:
The apostle of Allah (ﷺ) used to fast three days every month: Monday, Thursday and Monday in the next week. (RU)
Reference (RU): Sunan Abi Dawud 2451 (RU)
In-book reference (RU): Book 14, Hadith 139 (RU)
English translation (RU): Book 13, Hadith 2445 (RU)