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Grade : Sahih (Al-Albani)
حَدَّثَنَا مَحْمُودُ بْنُ خَالِدٍ، وَعَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ السَّمَرْقَنْدِيُّ، - وَأَنَا لِحَدِيثِهِ، أَتْقَنُ - قَالاَ حَدَّثَنَا مَرْوَانُ، - هُوَ ابْنُ مُحَمَّدٍ - عَنْ عَبْدِ اللَّهِ بْنِ وَهْبٍ، عَنْ يَحْيَى بْنِ عَبْدِ اللَّهِ بْنِ سَالِمٍ، عَنْ أَبِي بَكْرِ بْنِ نَافِعٍ، عَنْ أَبِيهِ، عَنِ ابْنِ عُمَرَ، قَالَ تَرَاءَى النَّاسُ الْهِلاَلَ فَأَخْبَرْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم أَنِّي رَأَيْتُهُ فَصَامَهُ وَأَمَرَ النَّاسَ بِصِيَامِهِ .
Narrated Abdullah ibn Umar: The people looked for the moon, so I informed the Messenger of Allah (ﷺ) that I had sighted it. He fasted and commanded the people to fast
"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