"The Messenger of Allah ﷺ cae out from the toilet and some food was brought to him. They said: 'Shall we bring you some water for Wudu'?' He said: 'I have only been ordered to perform Wudu' when standing for Salat.'"  

أَنَّ رَسُولَ اللَّهِ ﷺ خَرَجَ مِنَ الْخَلاَءِ فَقُرِّبَ إِلَيْهِ طَعَامٌ فَقَالُوا أَلاَ نَأْتِيكَ بِوَضُوءٍ قَالَ إِنَّمَا أُمِرْتُ بِالْوُضُوءِ إِذَا قُمْتُ إِلَى الصَّلاَةِ