´It was narrated from Abu Ayyub that the Prophet (ﷺ) said:` "Water is for Water." [1] [1] That is, water for peforming Ghusl is obligatory when the ejaculation of water (semen) occurs.
Hadith ReferenceSunan an-Nasa'i / Mention When Ghusal (A Purifying Bath) Is Obligatory And When It Is Not / Hadith: 199
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح
Hadith Takhrij«سنن ابن ماجہ/الطھارة 110 (607)، (تحفة الأشراف: 3469)، مسند احمد 5/ 416، 421، سنن الدارمی/الطہارة 74 (785) (صحیح)»