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Grade : Sahih (Al-Albani)
حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا عَبْدُ الْحَمِيدِ بْنُ حَبِيبِ بْنِ أَبِي الْعِشْرِينَ، حَدَّثَنَا الأَوْزَاعِيُّ، عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ، حَدَّثَنِي عَبْدُ اللَّهِ بْنُ أَبِي قَتَادَةَ، أَخْبَرَنِي أَبِي أَنَّهُ، سَمِعَ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ " إِذَا بَالَ أَحَدُكُمْ فَلاَ يَمَسَّ ذَكَرَهُ بِيَمِينِهِ وَلاَ يَسْتَنْجِ بِيَمِينِهِ " . حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، حَدَّثَنَا الأَوْزَاعِيُّ، بِإِسْنَادِهِ نَحْوَهُ .
Abdullah bin Abu Qatadah said:"My father told me that he heard the Messenger of Allah say: 'When anyone of you urinates, let him not touch his penis with his right hand nor clean himself with his right hand.'" Another chain with similar wording
"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