عَنْ حَرْبِ بْنِ عُبَيْدِ اللَّهِ الثَّقَفِيِّ مِنْ طَرِيقٍ ثَانٍ عَنْ خَالِهِ قَالَ أَتَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ فَذَكَرَ لَهُ أَشْيَاءَ فَسَأَلَهُ فَقَالَ أَعْشُرُهَا فَقَالَ إِنَّمَا الْعُشُورُ عَلَى الْيَهُودِ وَالنَّصَارَى وَلَيْسَ عَلَى أَهْلِ الْإِسْلَامِ عُشُورٌ
(Second chain of narration) Harb bin Ubaidullah Thaqafi narrates from his maternal uncle, who says: I came to the Noble Prophet (peace and blessings be upon him) and mentioned some matters before him. After that, I said: Should I collect tax? The Prophet (peace and blessings be upon him) said: Tax is imposed on the Jews and Christians; there is no tax upon the people of Islam.