صحیح ابن حبان
Ibn Hibban
كتاب الطهارة
Book of Purification
باب الغسل - ذكر البيان بأن الفرض في أول الإسلام كان عند الإكسال غسل ما مس المرأة منه ثم الوضوء للصلاة دون الاغتسال
Chapter on Ghusl – Clarification that in early Islam, the obligation was to wash what touched the woman and then perform ablution for prayer, not ghusl
1 hadith
Hadith 1169
Sayyiduna Abu Ayyub Ansari (may Allah be pleased with him) narrates: Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) informed me of this. He says: I asked, "O Messenger of Allah! A man goes to his wife (i.e., has intercourse with her) and he does not ejaculate." The Prophet (peace and blessings be upon him) said: "The woman should wash the moisture that has touched her and perform ablution, then offer prayer."