حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ الثِّقَةِ، عِنْدَهُ عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، وَعَنْ بُسْرِ بْنِ سَعِيدٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ فِيمَا سَقَتِ السَّمَاءُ وَالْعُيُونُ وَالْبَعْلِ الْعُشْرُ وَفِيمَا سُقِيَ بِالنَّضْحِ نِصْفُ الْعُشْرِ ‏"‏ ‏.‏

Yahya related to me from Malik from a reliable source fromSulayman ibn Yasar and from Busr ibn Said that the Messenger of Allah,may Allah bless him and grant him peace, said, "On land that iswatered by rain or springs or any natural means there is (zakat to payof) a tenth. On irrigated land there is (zakat of) a twentieth (topay)." Translation Not Available

Book reference: Muwatta Imam Malik Book 17 Hadith 611
Web reference: Muwatta Imam Malik Book 17 Hadith 34