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Grade : Sahih (Al-Albani)
حَدَّثَنَا أَيُّوبُ بْنُ مَنْصُورٍ، حَدَّثَنَا شُعَيْبُ بْنُ حَرْبٍ، عَنْ عَبْدِ الْعَزِيزِ بْنِ أَبِي رَوَّادٍ، أَخْبَرَنَا نَافِعٌ، عَنْ مُؤَذِّنٍ، لِعُمَرَ يُقَالُ لَهُ مَسْرُوحٌ أَذَّنَ قَبْلَ الصُّبْحِ فَأَمَرَهُ عُمَرُ فَذَكَرَ نَحْوَهُ . قَالَ أَبُو دَاوُدَ وَقَدْ رَوَاهُ حَمَّادُ بْنُ زَيْدٍ عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ عَنْ نَافِعٍ أَوْ غَيْرِهِ أَنَّ مُؤَذِّنًا لِعُمَرَ يُقَالُ لَهُ مَسْرُوحٌ أَوْ غَيْرُهُ . قَالَ أَبُو دَاوُدَ وَرَوَاهُ الدَّرَاوَرْدِيُّ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ كَانَ لِعُمَرَ مُؤَذِّنٌ يُقَالُ لَهُ مَسْعُودٌ وَذَكَرَ نَحْوَهُ وَهَذَا أَصَحُّ مِنْ ذَلِكَ .
Nafi' reported :A mu'adhdhin of ‘Umar, named Masruh, called the Adhan for the morning prayer before the break of dawn; ‘Umar commanded him (to repeat). The narrator reported the tradition in a similar way. Abu Dawud said: This tradition has been transmitted by al-Darawardi from ‘Ubaid Allah on the authority of Ibn ‘Umar, saying: there was a mu'adhdhin of ‘Umar, named Mas'ud. He then narrated the rest of the tradition. This version is more correct than one
"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