It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) ordered fasting on the day of Ashura.
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ata except Ubaydullah al-Ataki, and Abu Tumaylah is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 8063
Hadith Takhrij«أخرجه أحمد فى «مسنده» برقم: 14889، 14986»