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Grade : Hasan (Al-Albani)
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا ابْنُ إِدْرِيسَ، عَنْ مُحَمَّدِ بْنِ إِسْحَاقَ، عَنْ مُحَمَّدِ بْنِ أَبِي أُمَامَةَ بْنِ سَهْلٍ، عَنْ أَبِيهِ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ كَعْبِ بْنِ مَالِكٍ، - وَكَانَ قَائِدَ أَبِيهِ بَعْدَ مَا ذَهَبَ بَصَرُهُ عَنْ أَبِيهِ، كَعْبِ بْنِ مَالِكٍ أَنَّهُ كَانَ إِذَا سَمِعَ النِّدَاءَ، يَوْمَ الْجُمُعَةِ تَرَحَّمَ لأَسْعَدَ بْنِ زُرَارَةَ . فَقُلْتُ لَهُ إِذَا سَمِعْتَ النِّدَاءَ، تَرَحَّمْتَ لأَسْعَدَ بْنِ زُرَارَةَ قَالَ لأَنَّهُ أَوَّلُ مَنْ جَمَّعَ بِنَا فِي هَزْمِ النَّبِيتِ مِنْ حَرَّةِ بَنِي بَيَاضَةَ فِي نَقِيعٍ يُقَالُ لَهُ نَقِيعُ الْخَضِمَاتِ . قُلْتُ كَمْ أَنْتُمْ يَوْمَئِذٍ قَالَ أَرْبَعُونَ .
Narrated Ka'b ibn Malik: AbdurRahman ibn Ka'b ibn Malik said: When Ka'b ibn Malik heard the call to prayer on Friday, he prayed for As'ad ibn Zurarah. I asked him: What is the matter that when you hear the call to prayer, you pray for As'ad ibn Zurarah? He replied: This is because he held the Friday prayer for the first time for us at Hazm an-Nabit of Harrah belonging to Banu Bayadah in Naqi', called Naqi' al-Khadumat. I asked him: How many were you at that time ? He said: Forty
"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