Narrated Abu Sa’id Al-Khudri (rad):

Allah’s Messenger (ﷺ) said: “The water (of the ghusl) is due to the water (of sexual emission)”. [Reported by Muslim]

عَنْ أَبِي سَعِيدٍ اَلْخُدْرِيِّ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ اَلْمَاءُ مِنْ اَلْمَاءِ } رَوَاهُ مُسْلِم ٌ [1]‏ .‏