وَعَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ
قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَصُومُ مِنْ غُرَّةِ كُلِّ شَهْرٍ ثَلَاثَةَ أَيَّامٍ وَقَلَّمَا كَانَ يفْطر يَوْم الْجُمُعَةَ
Abdallah ibn Masud said that God’s messenger used to fast the first three days every month, and he would seldom break his fast on a Friday. Tirmidhi and Nasai transmitted it, and Abu Dawud transmitted up to “three days every month.”
Mishkat al-Masabih 1967, Book 8, Fasting, Hadith 101. 1 min read