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ibnmajah:1220 – Yaʿqūb b. Ḥumayd b. Kāsib > ʿAbdullāh b. Mūsá al-Taymī > Usāmah b. Zayd > ʿAbdullāh b. Yazīd a freed slave of al-Aswad b. Sufyān > Muḥammad b. ʿAbd al-Raḥman b. Thawbān > Abū Hurayrah

“The Prophet ﷺ came out to pray and said the Takbir, then he gestured to them to wait. He went and took a bath, and his head was dripping with water while he led them in prayer. When he finished he said: ‘I came out to you in a state of sexual impurity, and I forgot until I had started to pray.’”  

ابن ماجة:١٢٢٠ – حَدَّثَنَا يَعْقُوبُ بْنُ حُمَيْدِ بْنِ كَاسِبٍ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُوسَى التَّيْمِيُّ عَنْ أُسَامَةَ بْنِ زَيْدٍ عَنْ عَبْدِ اللَّهِ بْنِ يَزِيدَ مَوْلَى الأَسْوَدِ بْنِ سُفْيَانَ عَنْ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ ثَوْبَانَ عَنْ أَبِي هُرَيْرَةَ قَالَ

خَرَجَ النَّبِيُّ ﷺ إِلَى الصَّلاَةِ وَكَبَّرَ ثُمَّ أَشَارَ إِلَيْهِمْ فَمَكَثُوا ثُمَّ انْطَلَقَ فَاغْتَسَلَ وَكَانَ رَأْسُهُ يَقْطُرُ مَاءً فَصَلَّى بِهِمْ فَلَمَّا انْصَرَفَ قَالَ إِنِّي خَرَجْتُ إِلَيْكُمْ جُنُبًا وَإِنِّي نَسِيتُ حَتَّى قُمْتُ فِي الصَّلاَةِ  

See similar narrations below:

Collected by Aḥmad
ahmad:9786 – Wakīʿ > Usāmah b. Zayd > ʿAbdullāh b. Yazīd a freed slave of al-Aswad b. Sufyān > Ibn Thawbān > Abū Hurayrah

[Machine] The Prophet ﷺ went out to perform the prayer. When he made the takbeer, he looked at them, meaning, as you are, then he went out. He performed ablution and came back with water dripping from his head. He prayed with them, and after he finished praying, he said, "I was in a state of major impurity and forgot to perform ablution."  

أحمد:٩٧٨٦ – حَدَّثَنَا وَكِيعٌ قَالَ حَدَّثَنَا أُسَامَةُ بْنُ زَيْدٍ عَنْ عَبْدِ اللهِ بْنِ يَزِيدَ مَوْلَى الْأَسْوَدِ بْنِ سُفْيَانَ عَنِ ابْنِ ثَوْبَانَ عَنْ أَبِي هُرَيْرَةَ

أَنَّ النَّبِيَّ ﷺ خَرَجَ إِلَى الصَّلَاةِ فَلَمَّا كَبَّرَانْصَرَفَ وَأَوْمَأَ إِلَيْهِمْ أَيْ كَمَا أَنْتُمْ ثُمَّ خَرَجَ فَاغْتَسَلَ ثُمَّ جَاءَ وَرَأْسُهُ يَقْطُرُ فَصَلَّى بِهِمْ فَلَمَّا صَلَّى قَالَ إِنِّي كُنْتُ جُنُبًا فَنَسِيتُ أَنْ أَغْتَسِلَ