Sahih Bukhari

Narrated Zaid bin Khalid:I asked `Uthman bin `Affan about a person who engaged in intercourse but did no discharge. `Uthman replied, ""He should perform ablution like the one for an ordinary prayer but he must wash his penis."" `Uthman added, ""I heard it from Allah's Messenger (ﷺ)."" I asked `Ali Az-Zubair, Talha and Ubai bin Ka`b about it and they, too, gave the same reply. (This order was canceled later on and taking a bath became necessary for such cases)