Lady Rabi’ bint Mu’awwiz bin ‘Afra’ (may Allah be pleased with her) narrated: On the morning of ‘Ashura, the Messenger of Allah (peace and blessings be upon him) sent a message to the settlements of the Ansar, and said: “Whoever among you has fasted today, let him complete his fast, and whoever among you has not fasted, let him fast for the rest of the day.”
Hadith Referenceمسند اسحاق بن راهويه / كتاب الصوم / 420
Hadith Takhrij«بخاري ، كتاب الصوم ، باب صوم الصبيان ، رقم : 1960 . مسلم ، كتاب الصيام ، باب من اكل فى عاشورا الخ ، رقم : 1136 . سنن نسائي ، رقم : 23 . مسند احمد : 359/6»