Sahih Muslim Book - 13, Hadith - 2669

وَحَدَّثَنِى أَبُو بَكْرِ بْنُ نَافِعٍ الْعَبْدِىُّ حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ بْنِ لاَحِقٍ حَدَّثَنَا خَالِدُ بْنُ ذَكْوَانَ عَنِ الرُّبَيِّعِ بِنْتِ مُعَوِّذِ بْنِ عَفْرَاءَ قَالَتْ أَرْسَلَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- غَدَاةَ عَاشُورَاءَ إِلَى قُرَى الأَنْصَارِ الَّتِى حَوْلَ الْمَدِينَةِ « مَنْ كَانَ أَصْبَحَ صَائِمًا فَلْيُتِمَّ صَوْمَهُ وَمَنْ كَانَ أَصْبَحَ مُفْطِرًا فَلْيُتِمَّ بَقِيَّةَ يَوْمِهِ ». فَكُنَّا بَعْدَ ذَلِكَ نَصُومُهُ وَنُصَوِّمُ صِبْيَانَنَا الصِّغَارَ مِنْهُمْ إِنْ شَاءَ اللَّهُ وَنَذْهَبُ إِلَى الْمَسْجِدِ فَنَجْعَلُ لَهُمُ اللُّعْبَةَ مِنَ الْعِهْنِ فَإِذَا بَكَى أَحَدُهُمْ عَلَى الطَّعَامِ أَعْطَيْنَاهَا إِيَّاهُ عِنْدَ الإِفْطَارِ.

It was narrated that Ar- Rubayy bint Muawwidh bin Afra said: “On the morning of Ashura, the Messenger of Allah sent word to the villages of the Ansar around Al-Madinah, saying: ‘Whoever started the day fasting, let him complete his fast, and whoever started the day not fasting, let him complete the rest of the day (without food).’” “After that, we used to fast on this day, and we would make our children fast too, even the little ones if Allah wills. And we used to take them to Masjid. We would make them toys out of wool, and if one of them cried for food, we would give (that toy) to him until it was time to break the fast.”