"The Messenger of Allah sent me to Yemen and he commanded me to take one-tenth of whatever is irrigated by the sky, and half of one-tenth of whatever is irrigated by means of buckets." (Using translation from Nasāʾī 2490)   

«بَعَثَنِي رَسُولُ اللَّهِ ﷺ إِلَى الْيَمَنِ فَأَمَرَنِي أَنْ آخُذَ مِنَ الثِّمَارِ مَا يَسْقِي بَعْلًا الْعُشْرَ وَمَا سُقِيَ بِالسَّانِيَةِ فَنِصْفَ الْعُشْرِ»