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Grade : Sahih (Abu Ghuddah)
أَخْبَرَنَا سُوَيْدٌ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ هِشَامٍ، عَنِ ابْنِ سِيرِينَ، أَنَّ عَبْدَ اللَّهِ بْنَ يَزِيدَ الْخَطْمِيَّ، قَالَ كَتَبَ إِلَيْنَا عُمَرُ بْنُ الْخَطَّابِ رضى الله عنه أَمَّا بَعْدُ فَاطْبُخُوا شَرَابَكُمْ حَتَّى يَذْهَبُ مِنْهُ نَصِيبُ الشَّيْطَانِ فَإِنَّ لَهُ اثْنَيْنِ وَلَكُمْ وَاحِدٌ .
It was narrated that 'Abdullah bin Yazid Al-Khatmi said:"Umar bin Al-Khattab, may Allah be pleased with him, wrote to us (saying): 'Cook your drinks until the share of the Shaitan is gone, for he has two (shares) and you have one
"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