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Grade : Sahih (Al-Albani)
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا جَرِيرٌ، عَنْ أَبِي جَنَابٍ، عَنْ مَغْرَاءٍ الْعَبْدِيِّ، عَنْ عَدِيِّ بْنِ ثَابِتٍ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ سَمِعَ الْمُنَادِيَ فَلَمْ يَمْنَعْهُ مِنَ اتِّبَاعِهِ عُذْرٌ " . قَالُوا وَمَا الْعُذْرُ قَالَ خَوْفٌ أَوْ مَرَضٌ " لَمْ تُقْبَلْ مِنْهُ الصَّلاَةُ الَّتِي صَلَّى " . قَالَ أَبُو دَاوُدَ رَوَى عَنْ مَغْرَاءٍ أَبُو إِسْحَاقَ .
Narrated Abdullah ibn Abbas: If anyone hears him who makes the call to prayer and is not prevented from joining the congregation by any excuse--he was asked what an excuse consisted of and replied that it was fear or illness--the prayer he offers will not be accepted from 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