Abdur-Razzaq عبد الرزاق بن همام · The Book on Zakat

"The Prophet sent me to Yemen and ordered me to collect a Tabi or a Tabi'ah on every thirty cows, a Musinnah on every forty, a Dinar for every Halim, or its equivalent of Ma'afir."Abu Eisa said: This Hadith is Hasan. Some of them reported this Hadith from Sufyan, from Al-A'mash, from Abu Wa'il, from Masruq: "The Prophet sent Mu'adh to Yemen and ordered him to take..." and this is more authentic

the Prophet said: "Charity is not lawful for the rich nor for the physically fit."

Umar gave a horse to be used in the cause of Allah. Then he saw it being sold, so he wanted to buy it, but the Prophet said: "Do not take back what you have given in charity."