كتاب الحيض
3  
The Book of Menstruation
(31)
Chapter: It is permissible for one who has broken his wudu’ to eat, and there is nothing disliked about doing so, and wudu’ need not be done immediately
(31)
باب جَوَازِ أَكْلِ الْمُحْدِثِ الطَّعَامَ وَأَنَّهُ لاَ كَرَاهَةَ فِي ذَلِكَ وَأَنَّ الْوُضُوءَ لَيْسَ عَلَى الْفَوْرِ
Sahih Muslim 374 a

Ibn 'Abbas reported:

The Apostle of Allah (ﷺ) came out of the privy, and he was presented with some food, and the people reminded him about ablution, but he said: Am I to say prayer that I should perform ablution?
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى التَّمِيمِيُّ، وَأَبُو الرَّبِيعِ الزَّهْرَانِيُّ، قَالَ يَحْيَى أَخْبَرَنَا حَمَّادُ بْنُ زَيْدٍ، وَقَالَ أَبُو الرَّبِيعِ، حَدَّثَنَا حَمَّادٌ، عَنْ عَمْرِو بْنِ دِينَارٍ، عَنْ سَعِيدِ بْنِ الْحُوَيْرِثِ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم خَرَجَ مِنَ الْخَلاَءِ فَأُتِيَ بِطَعَامٍ فَذَكَرُوا لَهُ الْوُضُوءَ فَقَالَ ‏ "‏ أُرِيدُ أَنْ أُصَلِّيَ فَأَتَوَضَّأَ ‏"‏ ‏.‏
Reference : Sahih Muslim 374a
In-book reference : Book 3, Hadith 148
USC-MSA web (English) reference : Book 3, Hadith 725
  (deprecated numbering scheme)