The Book of Purification
1/169. Chapter:
When The Junub Person Wants To Have Intercourse Again
Sunan an-Nasai
أَخْبَرَنَا الْحُسَيْنُ بْنُ حُرَيْثٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَاصِمٍ، عَنْ أَبِي الْمُتَوَكِّلِ، عَنْ أَبِي سَعِيدٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِذَا أَرَادَ أَحَدُكُمْ أَنْ يَعُودَ تَوَضَّأَ " .
It was narrated from Abu Sa'eed that the Prophet (ﷺ) said: "When any one of you a wants to return (to have intercourse again), let him perform Wudu'."
Reference : Sunan an-Nasa'i 262In-book reference : Book 1, Hadith 263English translation : Vol. 1, Book 1, Hadith 263