عَنْ أَبِي أَيُّوبَ (الْأَنْصَارِيِّ) رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ: ((الْمَاءُ مِنَ الْمَاءِ))
It is narrated from Sayyiduna Abu Ayyub Ansari (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: The water of ghusl is used due to the discharge of the water of semen.