"The Prophet ﷺ sent a messenger to the village of the Ansar in the morning of the day of 'Ashura' (10th of Muharram) to announce: 'Whoever has eaten something should not eat but complete the fast, and whoever is observing the fast should complete it.' "She further said, "Since then we used to fast on that day regularly and also make our boys fast. We used to make toys of wool for the boys and if anyone of them cried for, he was given those toys till it was the time of the breaking of the fast."  

أَرْسَلَ النَّبِيُّ ﷺ غَدَاةَ عَاشُورَاءَ إِلَى قُرَى الأَنْصَارِ مَنْ أَصْبَحَ مُفْطِرًا فَلْيُتِمَّ بَقِيَّةَ يَوْمِهِ وَمَنْ أَصْبَحَ صَائِمًا فَلْيَصُمْ قَالَتْ فَكُنَّا نَصُومُهُ بَعْدُ وَنُصَوِّمُ صِبْيَانَنَا وَنَجْعَلُ لَهُمُ اللُّعْبَةَ مِنَ الْعِهْنِ فَإِذَا بَكَى أَحَدُهُمْ عَلَى الطَّعَامِ أَعْطَيْنَاهُ ذَاكَ حَتَّى يَكُونَ عِنْدَ الإِفْطَارِ  

The Prophet ﷺ ordered a man from the tribe of Bani Aslam to announce amongst the people that whoever had eaten should fast the rest of the day, and whoever had not eaten should continue his fast, as that day was the day of 'Ashura' .  

أَمَرَ النَّبِيُّ ﷺ رَجُلاً مِنْ أَسْلَمَ أَنْ أَذِّنْ فِي النَّاسِ أَنَّ مَنْ كَانَ أَكَلَ فَلْيَصُمْ بَقِيَّةَ يَوْمِهِ وَمَنْ لَمْ يَكُنْ أَكَلَ فَلْيَصُمْ فَإِنَّ الْيَوْمَ يَوْمُ عَاشُورَاءَ  

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  

AbdurRahman reported on the authority of his uncle that the people of the tribe Aslam came to the Prophet ﷺ. He said (to them): Did you fast on this day? They replied: No. He said: Complete the rest of your day, and make atonement for it.  

أَنَّ أَسْلَمَ أَتَتِ النَّبِيَّ ﷺ فَقَالَ صُمْتُمْ يَوْمَكُمْ هَذَا قَالُوا لاَ قَالَ فَأَتِمُّوا بَقِيَّةَ يَوْمِكُمْ وَاقْضُوهُ  

[Machine] The Prophet (pbuh) sent a man on the day of Ashura who embraced Islam saying, "Indeed, today is the day of Ashura, so whoever has eaten or drank should complete the rest of his day, and whoever has not eaten or drank should observe fasting."  

أَنَّ النَّبِيَّ ﷺ بَعَثَ يَوْمَ عَاشُورَاءَ رَجُلًا مِنْ أَسْلَمَ «إِنَّ الْيَوْمَ يَوْمُ عَاشُورَاءَ فَمَنْ كَانَ أَكَلَ أَوْ شَرِبَ فَلْيُتِمَّ بَقِيَّةَ يَوْمِهِ وَمَنْ لَمْ يَكُنْ أَكَلَ أَوْ شَرِبَ فَلْيَصُمْهُ»  

[Machine] The Messenger of Allah ﷺ sent a message to the Ansar villages surrounding Medina on the morning of Ashura, saying: "Whoever starts the day fasting, let them complete their fast; and whoever starts the day not fasting, let them fast the rest of the day." She (one of the narrators) said: "So we used to fast on that day, as well as make our young children fast, and we would take them to the mosque and give them toys made of wool. If one of them started crying from hunger, we would give them the toy until it was time to break the fast."  

أَرْسَلَ رَسُولُ اللَّهِ ﷺ غَدَاةَ عَاشُورَاءَ إِلَى قُرَى الْأَنْصَارِ الَّتِي حَوْلَ الْمَدِينَةِ «مَنْ كَانَ أَصْبَحَ صَائِمًا فَلْيُتِمَّ صَوْمَهُ وَمَنْ كَانَ أَصْبَحَ مُفْطِرًا فَلْيَصُمْ بَقِيَّةَ يَوْمِهِ ذَلِكَ» قَالَتْ فَكُنَّا نَصُومُهُ وَنُصَوِّمُ صِبْيَانَنَا الصِّغَارَ وَنَذْهَبُ بِهِمْ إِلَى الْمَسْجِدِ وَنَجْعَلُ لَهُمُ اللُّعْبَةَ مِنَ الْعِهْنِ فَإِذَا بَكَى أَحَدُهُمْ عَلَى الطَّعَامِ أَعْطَيْنَاهَا إِيَّاهُ حَتَّى يَكُونَ عِنْدَ الْإِفْطَارِ  

[Machine] The Messenger of Allah ﷺ sent on the morning of the day of Ashura to the towns of the Ansar that were around Madinah, saying, "Whoever wakes up fasting should complete his fast, and whoever wakes up without fasting should fast for the rest of the day." So we would fast it, and our young children would also fast. We would make toys for them from wool, and we would take them to the orchard. If any of them cried due to hunger, we would give them that (the toy) until it was time to break the fast.  

أَرْسَلَ رَسُولُ اللهِ ﷺ صَبِيحَةَ يَوْمَ عَاشُورَاءَ إِلَى قُرَى الْأَنْصَارِ الَّتِي حَوْلَ الْمَدِينَةِ «مَنْ كَانَ أَصْبَحَ صَائِمًا فَلْيُتِمَّ صَوْمَهُ وَمَنْ كَانَ أَصْبَحَ مُفْطِرًا فَلْيَصُمْ بَقِيَّةَ يَوْمِهِ» فَكُنَّا نَصُومُهُ وَيَصُومُ صِبْيَانُنَا الصِّغَارُ وَنَجْعَلُ لَهُمُ اللُّعْبَةَ مِنَ الْعِهْنِ وَنَذْهَبُ بِهِنَّ إِلَى الْبُسْتَانِ وَإِذَا بَكَى أَحَدُهُمْ عَلَى الطَّعَامِ أَعْطَيْنَاهُ ذَاكَ حَتَّى يَكُونَ عِنْدَ الْإِفْطَارِ  

[Machine] The Prophet ﷺ said to Aslam, "Fast today." They said, "But we have already eaten." He said, "Then fast the rest of your day, meaning the day of Ashura." Sa'id disagreed with him.  

أَنَّ النَّبِيَّ ﷺ قَالَ لِأَسْلَمَ «صُومُوا الْيَوْمَ» قَالُوا إِنَّا كُنَّا قَدْ أَكَلْنَا قَالَ «صُومُوا بَقِيَّةَ يَوْمِكُمْ يَعْنِي يَوْمَ عَاشُورَاءَ» خَالَفَهُ سَعِيدٌ  

[Machine] The Prophet ﷺ sent a man who had converted to Islam on the day of Ashura to his people, ordering them to fast on this day. The man said, "I do not think I will come to them until they have eaten." The Prophet ﷺ said, "Whoever among them eats, let him fast the rest of the day."  

أَنَّ النَّبِيَّ ﷺ بَعَثَ رَجُلًا مِنْ أَسْلَمَ يَوْمَ عَاشُورَاءَ إِلَى قَوْمِهِ يَأْمُرُهُمْ فَلْيَصُومُوا هَذَا الْيَوْمَ فَقَالَ مَا أَرَى آتِيَهُمْ حَتَّى يَطْعَمُوا قَالَ مَنْ طَعِمَ مِنْهُمْ فَلْيَصُمْ بَقِيَّةَ يَوْمِهِ  

The Prophet ﷺ ordered a man from the tribe of Bani Aslam to announce amongst the people that whoever had eaten should fast the rest of the day, and whoever had not eaten should continue his fast, as that day was the day of 'Ashura' . (Using translation from Bukhārī 2007)   

"أَذِّنْ في النَّاسِ: أَنَّ مَنْ كان أكَلَ فليَصُمْ بقيَّةَ يوْمِه، ومَنْ لم يكنْ أَكَلَ فليَصُمْ، فإِنَّ اليَوْمَ يومُ عاشُوراءَ".