Sayyiduna Muhammad bin Sayfi al-Ansari (may Allah be pleased with him) said: On the day of Ashura the Messenger of Allah (peace and blessings be upon him) came out to us and said: "Has anyone among you eaten anything today?" We said: Some have eaten and some have not eaten. He (peace and blessings be upon him) said: "Whoever has not eaten, let him complete his fast; and whoever has eaten something, let him complete the rest of his day." Then he (peace and blessings be upon him) sent word to the people of the countryside that they should do the same.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16579
It is narrated from Sayyiduna Muhammad bin Sayfi al-Ansari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said on the day of Ashura: "Whoever among you has eaten something, let him abstain for the rest of the day; and whoever has not eaten, let him fast." And he (peace and blessings be upon him) also sent word to the people of the countryside and ordered them to fast it.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16580
It is narrated from Sayyiduna Muhammad bin Sayfi (may Allah be pleased with him) that on the day of Ashura the Prophet (peace and blessings be upon him) ordered his caller to announce: "Whoever is fasting, let him continue his fast; and whoever has eaten and drunk, let him also complete his fast."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16581
Muhammad bin Sayfi (may Allah be pleased with him) said: I was grazing my family's goats in the valley of Uhud when I came upon two young rabbits. So I took a stone and slaughtered them with its sharp edge, then I came to the Prophet (peace and blessings be upon him) and told him (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Eat them."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16582