AHMAD 14477:
from Jābir b. ʿAbdullāh al-Anṣārī —
[Machine] I heard the Messenger of Allah ﷺ say, "Whoever fasts Ramadan and follows it with six days of Shawwal, it is as if they have fasted the entire year."
أحمد ١٤٤٧٧:
عن جابر بن عبد الله الانصاري —
سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ مَنْ صَامَ رَمَضَانَ وَسِتًّا مِنْ شَوَّالٍ فَكَأَنَّمَا صَامَ السَّنَةَ كُلَّهَا