AHMAD 23556:
from Abū Ayyūb —
[Machine] The Messenger of Allah ﷺ said: "Whoever fasts Ramadan and six days from the month of Shawwal, it is as if he has fasted the entire year."
أحمد ٢٣٥٥٦:
عن ابو ايوب —
أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَنْ صَامَ رَمَضَانَ وَسِتًّا مِنْ شَوَّالٍ فَقَدْ صَامَ الدَّهْرَ