IBNHIBBAN 3649:
from ʿUthmān —
[Machine] I heard the Messenger of Allah ﷺ say, "Fasting is a shield, like a shield of one of you in battle." And I heard the Messenger of Allah ﷺ say, "Fasting for three days every month is a good deed."
ابن حبّان ٣٦٤٩:
عن عثمان —
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «الصِّيَامُ جُنَّةٌ كَجُنَّةِ أَحَدِكُمْ مِنَ الْقِتَالِ» وَسَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «صِيَامٌ حَسَنٌ ثَلَاثَةُ أَيَّامٍ مِنْ كُلِّ شَهْرٍ»