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Grade : Sahih (Al-Albani)
حَدَّثَنَا مُحَمَّدُ بْنُ الْعَلاَءِ، وَالْحَسَنُ بْنُ عَلِيٍّ، وَمُحَمَّدُ بْنُ سُلَيْمَانَ الأَنْبَارِيُّ، قَالُوا حَدَّثَنَا أَبُو أُسَامَةَ، عَنِ الْوَلِيدِ بْنِ كَثِيرٍ، عَنْ مُحَمَّدِ بْنِ كَعْبٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ رَافِعِ بْنِ خَدِيجٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّهُ قِيلَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم أَنَتَوَضَّأُ مِنْ بِئْرِ بُضَاعَةَ وَهِيَ بِئْرٌ يُطْرَحُ فِيهَا الْحِيَضُ وَلَحْمُ الْكِلاَبِ وَالنَّتْنُ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الْمَاءُ طَهُورٌ لاَ يُنَجِّسُهُ شَىْءٌ " . قَالَ أَبُو دَاوُدَ وَقَالَ بَعْضُهُمْ عَبْدُ الرَّحْمَنِ بْنُ رَافِعٍ .
Narrated AbuSa'id al-Khudri: The people asked the Messenger of Allah (ﷺ): Can we perform ablution out of the well of Buda'ah, which is a well into which menstrual clothes, dead dogs and stinking things were thrown? He replied: Water is pure and is not defiled by anything
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari