Narrated Abu Sa’id Al-Khudri (rad):

Allah’s Messenger (ﷺ) said: “If one of you has sexual intercourse with his wife and wishes to repeat he should perform ablution between them” [Reported by Muslim].

وَعَنْ أَبِي سَعِيدٍ اَلْخُدْرِيِّ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ إِذَا أَتَى أَحَدُكُمْ أَهْلَهُ, ثُمَّ أَرَادَ أَنْ يَعُودَ فَلْيَتَوَضَّأْ بَيْنَهُمَا وُضُوءًا } رَوَاهُ مُسْلِم ٌ [1]‏ .‏