The Messenger of Allah passed by Sa'd when he was performing ablution, and he said: 'What is this extravagance?' He said: 'Can there be any extravagance in ablution?' He said: 'Yes, even if you are on the bank of a flowing river.'" (Using translation from Ibn Mājah 425)
أَنَّ النَّبِيَّ ﷺ مَرَّ بِسَعْدٍ وَهُوَ يَتَوَضَّأُ فَقَالَ مَا هَذَا السَّرَفُ يَا سَعْدُ؟ قَالَ أَفِي الْوُضُوءِ سَرَفٌ ؟ قَالَ نَعَمْ وَإِنْ كُنْتَ عَلَى نَهْرٍ جَارٍ