[Machine] The messenger of Allah ﷺ commanded us before the obligation of Zakat was revealed. Then Zakat was revealed, and we were neither prohibited from it nor commanded to do it, yet we still adhered to it. I asked him about fasting on the day of Ashura, and he said: the messenger of Allah ﷺ commanded us to fast on this day before the obligation of Ramadan was revealed. Then Ramadan was revealed, and we were neither commanded to fast on Ashura nor prohibited from it, yet we still fast on that day.  

أَمَرَنَا رَسُولُ اللهِ ﷺ قَبْلَ أَنْ تَنْزِلَ الزَّكَاةُ ثُمَّ نَزَلَتِ الزَّكَاةُ فَلَمْ نُنْهَ عَنْهَا وَلَمْ نُؤْمَرْ بِهَا وَنَحْنُ نَفْعَلُهُ وَسَأَلْتُهُ عَنْ صَوْمِ عَاشُورَاءَ فَقَالَ أَمَرَنَا رَسُولُ اللهِ ﷺ قَبْلَ أَنْ يَنْزِلَ رَمَضَانُ ثُمَّ نَزَلَ رَمَضَانُ فَلَمْ نُؤْمَرْ بِهِ وَلَمْ نُنْهَ عَنْهُ وَنَحْنُ نَفْعَلُهُ