MUSLIM 308:
from Abū Saʿīd al-Khudrī —
The Messenger of Allah ﷺ said: When anyone amongst you has sexual intercourse with his wife and then he intends to repeat it, he should perform ablution. In the hadith transmitted by Abu Bakr. (the words are):" Between the two (acts) there should be an ablution," or he (the narrator) said:" Then he intended that it should be repeated."
مسلم ٣٠٨:
عن ابو سعيد الخدري —
قَالَ رَسُولُ اللَّهِ ﷺ إِذَا أَتَى أَحَدُكُمْ أَهْلَهُ ثُمَّ أَرَادَ أَنْ يَعُودَ فَلْيَتَوَضَّأْ زَادَ أَبُو بَكْرٍ فِي حَدِيثِهِ بَيْنَهُمَا وُضُوءًا وَقَالَ ثُمَّ أَرَادَ أَنْ يُعَاوِدَ
hadithunlocked.com