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Grade : Sahih (Al-Albani)
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرُ بْنُ عَبْدِ الْحَمِيدِ، عَنْ مَنْصُورٍ، عَنْ أَبِي وَائِلٍ، قَالَ قَالَ الصُّبَىُّ بْنُ مَعْبَدٍ أَهْلَلْتُ بِهِمَا مَعًا . فَقَالَ عُمَرُ هُدِيتَ لِسُنَّةِ نَبِيِّكَ صلى الله عليه وسلم .
Narrated Umar ibn al-Khattab: As-Subayy ibn Ma'bad said: I raised my voice in talbiyah for both of them (i.e. umrah and hajj). Thereupon Umar said: You were guided to the practice (sunnah) of your Prophet (ﷺ)
"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