Some people from Syria came to ‘Umar and said: We have acquired wealth and horses and slaves,and we want to pay zakah on them as a purification. He said: I shall do what my two predecessors did. He consulted the Companions of Muhammad ﷺ, among whom was ‘Ali, and ‘Ali said: It is good, provided it does not become a regular tax that is taken from them after you are gone.
عَنْ حَارِثَةَ قَالَجَاءَ نَاسٌ مِنْ أَهْلِ الشَّامِ إِلَى عُمَرَ فَقَالُوا إِنَّا قَدْ أَصَبْنَا أَمْوَالًا وَخَيْلًاوَرَقِيقًا نُحِبُّ أَنْ يَكُونَ لَنَا فِيهَا زَكَاةٌ وَطَهُورٌ قَالَ مَا فَعَلَهُ صَاحِبَايَ قَبْلِي فَأَفْعَلَهُ وَاسْتَشَارَ أَصْحَابَ مُحَمَّدٍ ﷺ وَفِيهِمْ عَلِيٌّ فَقَالَ عَلِيٌّ هُوَ حَسَنٌ إِنْ لَمْ يَكُنْ جِزْيَةً رَاتِبَةً يُؤْخَذُونَ بِهَا مِنْ بَعْدِكَ