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Grade : Sahih (Al-Albani)
حَدَّثَنَا أَحْمَدُ بْنُ صَالِحٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنِي ابْنُ طَاوُسٍ، عَنْ أَبِيهِ، أَنَّ أَبَا الصَّهْبَاءِ، قَالَ لاِبْنِ عَبَّاسٍ أَتَعْلَمُ إِنَّمَا كَانَتِ الثَّلاَثُ تُجْعَلُ وَاحِدَةً عَلَى عَهْدِ النَّبِيِّ صلى الله عليه وسلم وَأَبِي بَكْرٍ وَثَلاَثًا مِنْ إِمَارَةِ عُمَرَ قَالَ ابْنُ عَبَّاسٍ نَعَمْ .
Tawus said:Abu al-Sahba' said to Ibn Abbas: Do you know that a divorce by three pronouncements was made a single one during the time of the Prophet (ﷺ), and of AbuBakr and in the early days of the caliphate of Umar? He replied: Yes
"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