Ablutions (Wudu')
4/34. Chapter:
Whosoever considers not to repeat ablution except if something is discharged or passed from exit (front or back private parts)
Sahih Bukhari
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، عَنْ مُنْذِرٍ أَبِي يَعْلَى الثَّوْرِيِّ، عَنْ مُحَمَّدٍ ابْنِ الْحَنَفِيَّةِ، قَالَ قَالَ عَلِيٌّ كُنْتُ رَجُلاً مَذَّاءً، فَاسْتَحْيَيْتُ أَنْ أَسْأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم فَأَمَرْتُ الْمِقْدَادَ بْنَ الأَسْوَدِ فَسَأَلَهُ فَقَالَ " فِيهِ الْوُضُوءُ ". وَرَوَاهُ شُعْبَةُ عَنِ الأَعْمَشِ.
Narrated `Ali: I used to get emotional urethral discharges frequently and felt shy to ask Allah's Messenger (ﷺ) about it. So I requested Al-Miqdad bin Al-Aswad to ask (the Prophet (ﷺ) ) about it. Al-Miqdad asked him and he replied, "One has to perform ablution (after it)."
Reference : Sahih al-Bukhari 178In-book reference : Book 4, Hadith 44USC-MSA web (English) reference : Vol. 1, Book 4, Hadith 178