عَنْ عَبْدِ الرَّحْمَنِ أَبِي الْمِنْهَالِ بْنِ مَسْلَمَةَ الْخُزَاعِيِّ عَنْ عَمِّهِ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ لِأَسْلَمَ: ((صُومُوا الْيَوْمَ))، قَالُوا: إِنَّا قَدْ أَكَلْنَا، قَالَ: ((صُومُوا بَقِيَّةَ يَوْمِكُمْ))، يَعْنِي يَوْمَ عَاشُورَاءَ
Abu Minhal Abdur Rahman narrates from his uncle that the Holy Prophet (peace and blessings be upon him) said to the people of the tribe of Banu Aslam on the day of Ashura: Fast today. They said: We have already eaten and drunk. The Prophet (peace and blessings be upon him) said: Observe the fast for the remainder of the day.