Kathir bin Marrah al-Hadrami كثير بن مرة الحضرمي · The Book of Zakah

"For whatever is irrigated by the sky, rivers and springs, or draws up water from deep roots, one-tenth. For whatever is irrigated by animals and artificial means, one half of one-tenth."

"Intercede and your intercession may be accepted, and Allah, the Mighty and Sublime, decrees on the lips of His Prophet whatsoever He will."