Salama b. al-Akwa' (Allah be pleased with him) reported that the Messenger of Allah ﷺ sent a person of the tribe of Aslam on the day of 'Ashura and commanded him to declare to the people to observe fast in case they had not observed it, and to complete fast till evening if they had taken food  

أَنَّهُ قَالَ بَعَثَ رَسُولُ اللَّهِ ﷺ رَجُلاً مِنْ أَسْلَمَ يَوْمَ عَاشُورَاءَ فَأَمَرَهُ أَنْ يُؤَذِّنَ فِي النَّاسِ مَنْ كَانَ لَمْ يَصُمْ فَلْيَصُمْ وَمَنْ كَانَ أَكَلَ فَلْيُتِمَّ صِيَامَهُ إِلَى اللَّيْلِ  

He who got up in the morning fasting (without eating anything) he should complete his fast, and he who had had his breakfast in the morning, he should complete the rest of the day (without food). The Companions said; We henceforth observed fast on it (on the day of 'Ashura) and, God willing, made our children observe that. We went to the mosque and made toys out of wool for them and when anyone felt hungry and wept for food we gave them these toys till it was the time to break the fast.  

أَرْسَلَ رَسُولُ اللَّهِ ﷺ غَدَاةَ عَاشُورَاءَ إِلَى قُرَى الأَنْصَارِ الَّتِي 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  

I asked Rubayyi' daugther of Mu'awwidh about fasting on the day of 'Ashura. Thereupon she said: The Messenger of Allah (may peace he upon him) sent his messenger to the villages of the Ansar, and the rest of the hadith is the same (but with this variation that one of the Companions) said:" We used to make toys out of wool and took (them to the mosque) along with us. When they (the children) asked us for food, we gave them these toys to play with, and these made them forgetful till they completed their fast."  

بَعَثَ رَسُولُ اللَّهِ ﷺ رُسُلَهُ فِي قُرَى الأَنْصَارِ فَذَكَرَ بِمِثْلِ حَدِيثِ بِشْرٍ غَيْرَ أَنَّهُ قَالَ وَنَصْنَعُ لَهُمُ اللُّعْبَةَ مِنَ الْعِهْنِ فَنَذْهَبُ بِهِ مَعَنَا فَإِذَا سَأَلُونَا الطَّعَامَ أَعْطَيْنَاهُمُ اللُّعْبَةَ تُلْهِيهِمْ حَتَّى يُتِمُّوا صَوْمَهُمْ