Hadith on Water: Conserve water even if you are on the banks of a running stream

Abdullah ibn Amr reported: The Messenger of Allah, peace and blessings be upon him, passed by Sa’d while he was performing ablution. The Prophet said, “What is this extravagance?” Sa’d said, “Is there extravagance with water in ablution?” The Prophet said, “Yes, even if you were on the banks of a flowing river.”

Source: Sunan Ibn Mājah 425

Grade: Sahih (authentic) according to Ahmad Shakir

عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَرَّ بِسَعْدٍ وَهُوَ يَتَوَضَّأُ فَقَالَ مَا هَذَا السَّرَفُ فَقَالَ أَفِي الْوُضُوءِ إِسْرَافٌ قَالَ نَعَمْ وَإِنْ كُنْتَ عَلَى نَهَرٍ جَارٍ

425 سنن ابن ماجه كتاب الطهارة وسننها باب ما جاء في القصد في الوضوء وكراهة التعدي فيه

المحدث أحمد شاكر خلاصة حكم المحدث إسناده صحيح في مسند أحمد 12/23