Muwatta Malik #57
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ زَيْدٍ الأَنْصَارِيِّ، أَنَّ أَنَسَ بْنَ مَالِكٍ، قَدِمَ مِنَ الْعِرَاقِ فَدَخَلَ عَلَيْهِ أَبُو طَلْحَةَ وَأُبَىُّ بْنُ كَعْبٍ فَقَرَّبَ لَهُمَا طَعَامًا قَدْ مَسَّتْهُ النَّارُ فَأَكَلُوا مِنْهُ فَقَامَ أَنَسٌ فَتَوَضَّأَ فَقَالَ أَبُو طَلْحَةَ وَأُبَىُّ بْنُ كَعْبٍ مَا هَذَا يَا أَنَسُ أَعِرَاقِيَّةٌ فَقَالَ أَنَسٌ لَيْتَنِي لَمْ أَفْعَلْ . وَقَامَ أَبُو طَلْحَةَ وَأُبَىُّ بْنُ كَعْبٍ فَصَلَّيَا وَلَمْ يَتَوَضَّآ .
It was related to me from Malik from Musa ibn Uqba from Abd ar-
Rahman ibn Yazid al-Ansari that when Anas ibn Malik came back from
Iraq, Abu Talha and Ubayy ibn Kab visited him. He brought them some
cooked food and they ate, and then Anas got up and did wudu. Abu Talha
and Ubayy ibn Kab asked, "What's this, Anas? Is it an Iraqi custom?"
and Anas said, "I wish I had not done it." (i.e. wudu). Abu Talha and
Ubayy ibn Kab both got up and prayed without doing wudu.
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About Muwatta Malik
This hadith is #57 from Muwatta Malik, in the Book of Purity.