Ibn 'Abbas said:

"Allah’s Messenger (ﷺ) emerged from having a bowel movement and he was brought a meal, so he was asked: 'Will you not perform the minor ritual ablution?' He replied: “Am I about to perform the ritual prayer, so that I should perform the minor ritual ablution'?”

حَدَّثَنَا سَعِيدُ بْنُ عَبْدِ الرَّحْمَنِ الْمَخْزُومِيُّ، قَالَ‏:‏ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ عَمْرِو بْنِ دِينَارٍ، عَنْ سَعِيدِ بْنِ الْحُوَيْرِثِ، عَنِ ابْنِ عَبَّاسٍ، قَالَ‏:‏ خَرَجَ رَسُولُ اللهِ صلى الله عليه وسلم مِنَ الْغَائِطِ فَأُتِيَ بِطَعَامٍ، فَقِيلَ لَهُ‏:‏ أَلا تَتَوَضَّأُ‏؟‏ فَقَالَ‏:‏ أَأُصَلِّي، فَأَتَوَضَّأُ‏.‏