Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) and Sayyiduna Jabir (may Allah be pleased with him) narrate this saying of the Prophet (peace and blessings be upon him): "Whoever fasts Ramadan and then after it fasts six days of Shawwal has fasted the whole year."
Al-Tabarani recorded it in al-Mu'jam al-Awsat. Its chain contains a narrator, Yahya bin Sa'id al-Mazini, who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5101
Hadith Gradingمحدثین:ضعیف جداً
Hadith Takhrij«أخرجه مسند أحمد برقم: 13890، وأخرجه المعجم الأوسط للطبراني برقم: 8974»