وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنِ السَّائِبِ بْنِ يَزِيدَ، أَنَّهُ قَالَ كُنْتُ غُلاَمًا عَامِلاً مَعَ عَبْدِ اللَّهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ عَلَى سُوقِ الْمَدِينَةِ فِي زَمَانِ عُمَرَ بْنِ الْخَطَّابِ فَكُنَّا نَأْخُذُ مِنَ النَّبَطِ الْعُشْرَ ‏.‏

Yahya related to me from Malik from Ibn Shihab that as-Sa'ib ibnYazid said, "As a young man I used to work with Abdullah ibn Utba ibnMasud in the market of Madina in the time of Umar ibn al-Khattab andwe used to take a tenth from the Nabateans." Translation Not Available

Book reference: Muwatta Imam Malik Book 17 Hadith 624
Web reference: Muwatta Imam Malik Book 17 Hadith 48