صحیح ابن حبان
Ibn Hibban
كتاب الطهارة
Book of Purification
باب نواقض الوضوء - ذكر خبر ثان يصرح بأن الوضوء من مس الفرج إنما هو وضوء الصلاة وإن كانت العرب تسمي غسل اليدين وضوءا
Chapter on Nullifiers of Ablution – Second report clarifying that ablution after touching the private part is the ablution for prayer, even though Arabs may call washing the hands "wudu"
1 hadith
Hadith 1116
Sayyida Busrah (may Allah be pleased with her) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "Whoever touches his private part should perform the ablution as is done for prayer."