[Machine] About his father, who was from the companions of Hudhaybiyyah, and his brother whom the Messenger of Allah ﷺ sent him to command his people to observe the fast of Ashura, and he was Asma' bint Harithah. The Messenger of Allah ﷺ sent him and said, "Command your people to fast on this day." He said, "What if I find them having already eaten?" He said, "Then let them complete the rest of their day."  

عَنْ أَبِيهِ وَكَانَ مِنْ أَصْحَابِ الْحُدَيْبِيَةِ وَأَخُوهُ الَّذِي بَعَثَهُ رَسُولُ اللهِ ﷺ يَأْمُرُ قَوْمَهُ بِصِيَامِ يَوْمِ عَاشُورَاءَ وَهُوَ أَسْمَاءُ بْنُ حَارِثَةَ أَنَّ رَسُولَ اللهِ ﷺ بَعَثَهُ فَقَالَ مُرْ قَوْمَكَ فَلْيَصُومُوا هَذَا الْيَوْمَ قَالَ أَرَأَيْتَ إِنْ وَجَدْتُهُمْ قَدْ طَعِمُوا؟ قَالَ فَلْيُتِمُّوا آخِرَ يَوْمِهِمْ