حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، كَانَ يَحْمِلُ فِي الْعَامِ الْوَاحِدِ عَلَى أَرْبَعِينَ أَلْفِ بَعِيرٍ يَحْمِلُ الرَّجُلَ إِلَى الشَّامِ عَلَى بَعِيرٍ وَيَحْمِلُ الرَّجُلَيْنِ إِلَى الْعِرَاقِ عَلَى بَعِيرٍ فَجَاءَهُ رَجُلٌ مِنْ أَهْلِ الْعِرَاقِ فَقَالَ احْمِلْنِي وَسُحَيْمًا ‏.‏ فَقَالَ لَهُ عُمَرُ بْنُ الْخَطَّابِ نَشَدْتُكَ اللَّهَ أَسُحَيْمٌ زِقٌّ قَالَ لَهُ نَعَمْ ‏.‏

Yahya related to me from Malik from Yahya ibn Said that Umar ibnal-Khattab in one year gave 40,000 camels as mounts. Sometimes hewould give one man a camel to himself. Sometimes he would give onecamel between two men to take them to Iraq. A man from Iraq came tohim and said, "Give Suhaym and I a mount.''Umar ibn al-Khattab said tohim,"l demand from you, by Allah!, is Suhaym a water skin?" He said,"Yes." Translation Not Available

Book Ref: Muwatta Imam Malik Book 21 Hadith 998
Web Ref:  Muwatta Imam Malik Book 21 Hadith 38