[Machine] The Messenger of Allah ﷺ mandated that a tenth of the produce be given in cases of rainwater, river water, and well water, but only a fifth of the produce is to be given in cases of water from springs. Hatim said: "Ghayl is what is watered in abundance, and Ba'l is the fertility that is watered by rainwater." Yahya bin Adam asked Aba Iyas (meaning Asadi), who said: "Ba'l, Athari, and 'Adhi are what are watered by rainwater." Yahya said: "'Adhi is what is specially grown for rainclouds and is only watered by rainwater. That is 'Adhi, and Ba'l is what comes from vineyards whose roots have reached the water in the ground, so it does not need to be watered for five years, and it can tolerate not being watered for six years. This is Ba'l. The Sayl is the water of the valley when it flows, and as for Ghayl, it is a flood without excessive water flow. When there is little water flow with pure water, it is Ghayl, and 'Adhi is the water of rain."  

فَرَضَ رَسُولُ اللهِ ﷺ فِيمَا سَقَتِ السَّمَاءُ أَوْ سُقِيَ بِالسَّيْلِ وَالْغَيْلِ وَالْبَعْلِ الْعُشْرُ وَمَا سُقِيَ بِالنَّوَاضِحِ فَنِصْفُ الْعُشْرِ قَالَ حَاتِمٌ الْغَيْلُ مَا سُقِيَ فَتْحًا وَالْبَعْلُ هُوَ الْعَذْيُ الَّذِي يَسْقِيَهِ مَاءُ الْمَطَرِ قَالَ يَحْيَى بْنُ آدَمَ وَسَأَلْتُ أَبَا إِيَاسٍ يَعْنِي الْأَسَدِيَّ فَقَالَ الْبَعْلُ وَالْعَثَرِيُّ وَالْعَذْيُ هُوَ الَّذِي يُسْقَى بِمَاءِ السَّمَاءِ قَالَ يَحْيَى الْعَثَرِيُّ مَا يُزْرَعُ لِلْسَحَابِ لِلْمَطَرِ خَاصَّةً لَيْسَ يُسْقَى إِلَّا بِمَاءٍ يُصِيبُهُ مِنَ الْمَطَرِ فَذَلِكَ الْعَثَرِيُّ وَالْبَعْلُ مَا كَانَ مِنَ الْكُرُومِ قَدْ ذَهَبَتْ عُرُوقُهُ فِي الْأَرْضِ إِلَى الْمَاءِ فَلَا يَحْتَاجُ إِلَى السَّقْيِ الْخَمْسَ السِّنِينَ وَالسِّتَّ يَحْتَمِلُ تَرْكَ السَّقْيِ فَهَذَا الْبَعْلُ وَالسَّيْلُ مَاءُ الْوَادِي إِذَا سَالَ وَأَمَّا الْغَيْلُ فَهُوَ سَيْلٌ دُونَ السَّيْلِ الْكَثِيرِ إِذَا سَالَ الْقَلِيلُ بِالْمَاءِ الصَّافِي فَهُوَ الْغَيْلُ وَالْعَذْيُ مَاءُ الْمَطَرِ