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Grade : Sahih (Abu Ghuddah)
أَخْبَرَنَا مُحَمَّدُ بْنُ يَحْيَى بْنِ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا يَعْقُوبُ، قَالَ حَدَّثَنَا أَبِي، عَنْ صَالِحٍ، عَنِ ابْنِ شِهَابٍ، أَنَّ السَّائِبَ بْنَ يَزِيدَ، أَخْبَرَهُ قَالَ إِنَّمَا أَمَرَ بِالتَّأْذِينِ الثَّالِثِ عُثْمَانُ حِينَ كَثُرَ أَهْلُ الْمَدِينَةِ وَلَمْ يَكُنْ لِرَسُولِ اللَّهِ صلى الله عليه وسلم غَيْرُ مُؤَذِّنٍ وَاحِدٍ وَكَانَ التَّأْذِينُ يَوْمَ الْجُمُعَةِ حِينَ يَجْلِسُ الإِمَامُ .
As-Sa'ib bin Yazid said:"The third Adhan was ordered by 'Uthman when the number of people in Al-Madinah increased. The Messenger of Allah (ﷺ) only had one Adhan, and the Adhan on Friday was when the Imam sat down
"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