[Machine] Narrated from the Messenger of Allah ﷺ : "Whoever fasts Ramadan and follows it with six days of Shawwal, it is as if he fasted the entire year." Abu Abdur-Rahman Saad ibn Sa'id said, "It is a weak narration." Likewise, Ahmad ibn Hanbal said, "They are three brothers: Yahya ibn Sa'id ibn Qays, who is trustworthy and reliable, and Abdul Rabih ibn Sa'id, who is also acceptable, and Saad ibn Sa'id, the third, who is weak."  

عَنْ رَسُولِ اللهِ ﷺ قَالَ «مَنْ صَامَ رَمَضَانَ وَسِتَّةً مِنْ شَوَّالٍ فَكَأَنَّمَا صَامَ الدَّهْرَ» قَالَ أَبُو عَبْدِ الرَّحْمَنِ سَعْدُ بْنُ سَعِيدٍ ضَعِيفٌ كَذَلِكَ قَالَ أَحْمَدُ بْنُ حَنْبَلٍ وَهُمْ ثَلَاثَةُ إِخْوَةٍ يَحْيَى بْنُ سَعِيدِ بْنِ قَيْسٍ الثِّقَةُ الْمَأْمُونُ أَحَدُ الْأَئِمَّةِ وَعَبْدُ رَبِّهِ بْنُ سَعِيدٍ لَا بَأْسَ بِهِ وَسَعْدُ بْنُ سَعِيدٍ ثَالِثُهُمْ ضَعِيفٌ