[Machine] From the Prophet ﷺ, he said: When a person sits between the four parts of their body and then exerts effort, then it becomes obligatory to perform ghusl. And in the narration of Matar, even if it does not rain.
عَنِ النَّبِيِّ ﷺ قَالَ إِذَا جَلَسَ بَيْنَ شُعَبِهَا الْأَرْبَعِ ثُمَّ جَهَدَهَا فَقَدْ وَجَبَ الْغُسْلُ وَفِي حَدِيثِ مَطَرٍ وَإِنْ لَمْ يُنْزِلْ