Ibn Kathir reported: Umar ibn Abdul Aziz, may Allah be pleased with him, said, “Verily, Allah has only sent Muhammad, peace and blessings be upon him, as a preacher. He did not send him as a tax collector.”
Source: al-Bidāyah wal-Nihāyah 13/667
عن ابن كثير قال عمر بن عبد العزيز رضي الله عنه إِنَّ اللَّهَ إِنَّمَا بَعَثَ مُحَمَّدًا صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ دَاعِيًا وَلَمْ يَبْعَثْهُ جَابِيًا
13/667 البداية والنهاية سنة مائة من الهجرة النبوية