He came to Ubayy bin Ka'b accompanied by 'Umar. Ubayy came out to them and said: "I noticed some prostatic fluid, so I washed my penis and performed ablution. 'Umar said: "Is that sufficient?" He said: "Yes." He ('Umar) asked: "Did you hear that from the messenger of Allah?" He said: "Yes."
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، سَمِعْتُ سُفْيَانَ، يَقُولُ لِزَائِدَةَ بْنِ قُدَامَةَ يَا أَبَا الصَّلْتِ هَلْ سَمِعْتَ فِي، هَذَا شَيْئًا فَقَالَ حَدَّثَنَا سَلَمَةُ بْنُ كُهَيْلٍ، عَنْ كُرَيْبٍ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ قَامَ مِنَ اللَّيْلِ فَدَخَلَ الْخَلاَءَ فَقَضَى حَاجَتَهُ ثُمَّ غَسَلَ وَجْهَهُ وَكَفَّيْهِ ثُمَّ نَامَ . حَدَّثَنَا أَبُو بَكْرِ بْنُ خَلاَّدٍ الْبَاهِلِيُّ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، حَدَّثَنَا شُعْبَةُ، أَنْبَأَنَا سَلَمَةُ بْنُ كُهَيْلٍ، أَنْبَأَنَا بُكَيْرٌ، عَنْ كُرَيْبٍ، قَالَ فَلَقِيتُ كُرَيْبًا فَحَدَّثَنِي عَنِ ابْنِ عَبَّاسٍ، عَنِ النَّبِيِّ ـ صلى الله عليه وسلم ـ فَذَكَرَ نَحْوَهُ .
The Prophet got up during the night and went to the toilet and relieved himself, then he washed his face and hands, and went back to sleep. (Sahih) Another chain with similar wording.
حَدَّثَنَا إِسْمَاعِيلُ بْنُ تَوْبَةَ، حَدَّثَنَا زِيَادُ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا الْفَضْلُ بْنُ مُبَشِّرٍ، قَالَ رَأَيْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ يُصَلِّي الصَّلَوَاتِ بِوُضُوءٍ وَاحِدٍ . فَقُلْتُ مَا هَذَا فَقَالَ رَأَيْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَصْنَعُ هَذَا فَأَنَا أَصْنَعُ كَمَا صَنَعَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ .
"I saw Jabir bin 'Abdullah performing every prayer with one ablution, and I said: 'What is this?' He said: 'I saw the Messenger of Allah doing this, and I am doing as the Messenger of Allah did.'"
"I was listening to 'Abdullah bin 'Umar bin Khattab in the mosque, and when the time for prayer came, he got up, performed ablution, and offered prayer, then he went back to where he had been sitting. When the time for 'Asr (Afternnon prayer) came, he got up, performed ablution, and offered prayer, then he went back to where he had been sitting. When the time for Maghrib (Sunset prayer) came, he got up, performed ablution, and offered prayer, then he went back to where he had been sitting. I said: 'May Allah improve you (i.e., your condition) Is it obligatory or Sunnah to perform ablution for every prayer?' He said: 'Did you notice that?' I said: 'Yes.' He said: 'No (it is not obligatory). If I perform ablution for Morning prayer I can perform all of the prayers with this ablution, so as long as I do not get impure. But I heard the Messenger of Allah say: "Whoever performs ablution while he is pure, he will have ten merits." So I wanted to earn the merits.'"
"A complaint was made to the Prophet about a man who sensed something (some doubt about his ablution) during prayer. He said: 'No (he does not have to perform ablution) unless he notices a smell or hears a sound.'"
"I saw Sa'ib bin Yazid sniffing his garment, and I said: 'Why (are you doing) that?' He said: 'I heard the Messenger of Allah say: "No ablution (is needed) unless there is an odor or a sound."