Yahya related to me from Ibn Shihab from Salim ibn Abdullah from his father that Umar ibn al-Khattab used to take a twentieth from the cereals and olive oil of the Nabatean christians, intending by that to increase the cargo to Madina. He would take a tenth from pulses.
أَنَّ عُمَرَ بْنَ الْخَطَّابِ كَانَ يَأْخُذُ مِنَ النَّبَطِ مِنَ الْحِنْطَةِ وَالزَّيْتِ نِصْفَ الْعُشْرِ يُرِيدُ بِذَلِكَ أَنْ يَكْثُرَ الْحَمْلُ إِلَى الْمَدِينَةِ وَيَأْخُذُ مِنَ الْقُطْنِيَّةِ الْعُشْرَ