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Grade : Hasan Sahih (Al-Albani)
حَدَّثَنَا أَبُو كَامِلٍ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، حَدَّثَنَا حُسَيْنٌ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، - يَعْنِي مَوْلَى مَيْمُونَةَ - قَالَ أَتَيْتُ ابْنَ عُمَرَ عَلَى الْبَلاَطِ وَهُمْ يُصَلُّونَ فَقُلْتُ أَلاَ تُصَلِّي مَعَهُمْ قَالَ قَدْ صَلَّيْتُ إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " لاَ تُصَلُّوا صَلاَةً فِي يَوْمٍ مَرَّتَيْنِ " .
Narrated Abdullah ibn Umar: Sulayman, the freed slave of Maymunah, said: I came to Ibn Umar at Bilat (a place in Medina) while the people were praying. I said: Do you not pray along with them? He said: I heard the Messenger of Allah (ﷺ) say: Do not say a prayer twice in a day
"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