The Apostle of Allah ﷺ came out of the privy after relieving himself, and food was brought to him and he took it, and did not touch water. In another narration transmitted by Sa'id b. al-Huwairith it is like this: It was said to the Messenger of Allah ﷺ You have not performed ablution. He said: I do not intend to say prayer that I should perform ablution.  

أَنَّهُ سَمِعَ ابْنَ عَبَّاسٍ يَقُولُ إِنَّ النَّبِيَّ ﷺ قَضَى حَاجَتَهُ مِنَ الْخَلاَءِ فَقُرِّبَ إِلَيْهِ طَعَامٌ فَأَكَلَ وَلَمْ يَمَسَّ مَاءً قَالَ وَزَادَنِي عَمْرُو بْنُ دِينَارٍ عَنْ سَعِيدِ بْنِ الْحُوَيْرِثِ أَنَّ النَّبِيَّ ﷺ قِيلَ لَهُ إِنَّكَ لَمْ تَوَضَّأْ قَالَ مَا أَرَدْتُ صَلاَةً فَأَتَوَضَّأَ وَزَعَمَ عَمْرٌو أَنَّهُ سَمِعَ مِنْ سَعِيدِ بْنِ الْحُوَيْرِثِ  

When the Messenger of Allah ﷺ entered the privy, and in the hadith transmitted by Hushaim (the words are): When the Messenger of Allah ﷺ entered the lavatory, be used to say: O Allah, I seek refuge in Thee from wicked and noxious things.  

عَنْ أَنَسٍ فِي حَدِيثِ حَمَّادٍ كَانَ رَسُولُ اللَّهِ ﷺ إِذَا دَخَلَ الْخَلاَءَ وَفِي حَدِيثِ هُشَيْمٍ أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا دَخَلَ الْكَنِيفَ قَالَ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْخُبْثِ وَالْخَبَائِثِ  

I seek refuge with Allah from the wicked and noxious things.  

وَقَالَ أَعُوذُ بِاللَّهِ مِنَ الْخُبْثِ وَالْخَبَائِثِ  

(The people) stood up for prayer and the Messenger of Allah ﷺ was whispering to a man, and in the narration of 'Abd al-Warith (the words are): The Apostle of Allah ﷺ was having a private conversation with a man, and did not start the prayer till the people dozed off.  

أُقِيمَتِ الصَّلاَةُ وَرَسُولُ اللَّهِ ﷺ نَجِيٌّ لِرَجُلٍ وَفِي حَدِيثِ عَبْدِ الْوَارِثِ وَنَبِيُّ اللَّهِ ﷺ يُنَاجِي الرَّجُلَ فَمَا قَامَ إِلَى الصَّلاَةِ حَتَّى نَامَ الْقَوْمُ  

(The people) stood up for prayer and the Messenger of Allah ﷺ was talking in whispers with a man, and he did not discontinue the conversation till his Companions dozed off; he then came and led the prayer.  

أُقِيمَتِ الصَّلاَةُ وَالنَّبِيُّ ﷺ يُنَاجِي رَجُلاً فَلَمْ يَزَلْ يُنَاجِيهِ حَتَّى نَامَ أَصْحَابُهُ ثُمَّ جَاءَ فَصَلَّى بِهِمْ  

I heard Anas as saying that the Companion of the Messenger of Allah ﷺ dozed off and then offered prayer and did not perform ablution. He (the narrator) said: I asked him if he had actually heard it from Anas. He said: By Allah. yes.  

سَمِعْتُ أَنَسًا يَقُولُ كَانَ أَصْحَابُ رَسُولِ اللَّهِ ﷺ يَنَامُونَ ثُمَّ يُصَلُّونَ وَلاَ يَتَوَضَّئُونَ قَالَ قُلْتُ سَمِعْتَهُ مِنْ أَنَسٍ قَالَ إِي وَاللَّهِ  

(The people) stood up for the night prayer when a man spoke forth: I need to say something. The Apostle of Allah ﷺ entered into secret conversation with him, till the people dozed off or some of the people (dozed off), and then they said the prayer.  

رَجُلٌ لِي حَاجَةٌ فَقَامَ النَّبِيُّ ﷺ يُنَاجِيهِ حَتَّى نَامَ الْقَوْمُ أَوْ بَعْضُ الْقَوْمِ ثُمَّ صَلَّوْا