صحیح ابن حبان
Ibn Hibban
كتاب الطهارة
Book of Purification
باب أحكام الجنب - ذكر الإباحة للجنب ترك الاغتسال عند إرادة النوم بعد غسل الفرج والوضوء للصلاة
Chapter on Rules for the Junub – Permission for a person in a state of major impurity to sleep after washing the private part and performing ablution for prayer
1 hadith
Hadith 1214
Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: Sayyiduna Umar (may Allah be pleased with him) mentioned before the Prophet (peace and blessings be upon him) that he becomes in a state of janabah during the night, so the Prophet (peace and blessings be upon him) instructed him to perform wudu, wash his private parts, and then go to sleep.