It was narrated that `Ali bin Abi Talib (رضي الله عنه) said: The Messenger of Allah (ﷺ) led us in prayer. He left then he came back, and his head was dripping with water, and he led us in prayer. Then he said: `I led you in prayer just now when I was junub. Whoever is in the state I was in or hears a sound in his stomach, let him do what I did.`
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبْد اللَّهِ، قَالَ وَجَدْتُ هَذَا الْحَدِيثَ فِي كِتَابِ أَبِي وَأَكْثَرُ عِلْمِي إِنْ شَاءَ اللَّهُ أَنِّي سَمِعْتُهُ مِنْهُ حَدَّثَنَا أَبُو سَعِيدٍ مَوْلَى بَنِي هَاشِمٍ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ لَهِيعَةَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ هُبَيْرَةَ عَنْ عَبْدِ اللَّهِ بْنِ زُرَيْرٍ الْغَافِقِيِّ عَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ قَالَ صَلَّى بِنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَوْمًا فَانْصَرَفَ ثُمَّ جَاءَ وَرَأْسُهُ يَقْطُرُ مَاءً فَصَلَّى بِنَا ثُمَّ قَالَ إِنِّي صَلَّيْتُ بِكُمْ آنِفًا وَأَنَا جُنُبٌ فَمَنْ أَصَابَهُ مِثْلُ الَّذِي أَصَابَنِي أَوْ وَجَدَ رِزًّا فِي بَطْنِهِ فَلْيَصْنَعْ مِثْلَ مَا صَنَعْتُ.
sunnah.com