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Grade : Sahih (Abu Ghuddah)
أَخْبَرَنَا أَحْمَدُ بْنُ عُثْمَانَ بْنِ حَكِيمٍ، قَالَ حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا الْحَسَنُ بْنُ صَالِحٍ، عَنِ السُّدِّيِّ، عَنْ عَدِيِّ بْنِ ثَابِتٍ، عَنِ الْبَرَاءِ، قَالَ لَقِيتُ خَالِي وَمَعَهُ الرَّايَةُ فَقُلْتُ أَيْنَ تُرِيدُ قَالَ أَرْسَلَنِي رَسُولُ اللَّهِ صلى الله عليه وسلم إِلَى رَجُلٍ تَزَوَّجَ امْرَأَةَ أَبِيهِ مِنْ بَعْدِهِ أَنْ أَضْرِبَ عُنُقَهُ أَوْ أَقْتُلَهُ .
It was narrated that Al-Bara' said:"I met my maternal uncle who was carrying a flag (for an expedition) and I said: 'Where are you going?' He said: 'The Messenger of Allah is sending me to a man who has married his father's wife after he died, to strike his neck or kill him
"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