صحیح ابن حبان
Ibn Hibban
كتاب الطهارة
Book of Purification
باب الغسل - ذكر البيان بأن المرأة وزوجها إذا أرادا الاغتسال من الجنابة يجب أن تبدأ المرأة فتفرغ على يديه ثم يغتسلان معا
Chapter on Ghusl – Clarification that when a husband and wife both need ghusl, the woman should pour water on his hands first, then they both bathe
1 hadith
Hadith 1192
Mu’adhah ‘Adawiyyah narrates: I asked Sayyidah ‘Aishah (may Allah be pleased with her): Can a woman perform ghusl of janabah with her husband from the same vessel, while both of them bathe together? Sayyidah ‘Aishah (may Allah be pleased with her) replied: Yes, water is pure; janabah does not affect it. I and the Prophet (peace and blessings be upon him) used to perform ghusl from the same vessel. I would pour water over your (the Prophet’s) hand before you put your hand into the water.