Sayyiduna Jabir (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) commanded us regarding the day of Ashura that we should fast on it, and he said: "It is a day on which the Jews used to fast."
Ahmad and al-Tabarani in al-Mu'jam al-Awsat recorded it. Its chain contains a narrator, Ibn Lahi'ah, who is hasan al-hadith (good in hadith), and he has been criticised.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5114
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه احمد فى المسند (340/3) ، أخرجه مسند أحمد برقم: 14253، وأخرجه المعجم الأوسط للطبراني برقم: 8059»