Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "Fast on the day of Ashura, and differ from the Jews regarding it: fast one day before it or one day after it as well."
Ahmad and al-Bazzar recorded it. Its chain contains a narrator, Muhammad bin Abi Layla, and he has been criticised.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5134
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه احمد فى المسند (2154) . اخرجه البزار فى المسند (1052) ، أخرجه مسند أحمد برقم: 2155، وأخرجه سنن الدارمي برقم: 1759»
Sayyidah Aishah Siddiqah (may Allah be pleased with her) narrates: The Prophet (peace and blessings be upon him) commanded that the fast of Ashura be kept on the tenth day.
Al-Bazzar recorded it, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5135
Hadith Gradingمحدثین:إسنادہ صحیح
Hadith Takhrij«اخرجه البزار فى المسند (1051) ، أخرجه مسند أحمد برقم: 16072، وأخرجه سنن الدارمي برقم: 1761»