Yahya related to me from Malik from Yahya ibn Said that Umar ibn
al-Khattab in one year gave 40,000 camels as mounts. Sometimes he
would give one man a camel to himself. Sometimes he would give one
camel between two men to take them to Iraq. A man from Iraq came to
him and said, "Give Suhaym and I a mount.''Umar ibn al-Khattab said to
him,"l demand from you, by Allah!, is Suhaym a water skin?" He said,
"Yes."
Muwatta Malik Book 21, Hadith 40