From Sahih Muslim (Hadith 786):
A'isha the wife of the Messenger of Allah (ﷺ) reported. A person asked the Messenger of Allah (ﷺ) about one who has sexual intercourse with his wife and parts away (without orgasm) whether bathing is obligatory for him. 'A'isha was sitting by him. The Messenger of Allah (ﷺ) said:I and she (the Mother of the Faithful) do it and then take a bath
Reference: Muslim 786