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Grade : Sahih (Al-Albani)
حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، وَعُثْمَانُ بْنُ أَبِي شَيْبَةَ الْمَعْنَى، قَالاَ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، عَنْ سُفْيَانَ بْنِ حُسَيْنٍ، عَنِ الزُّهْرِيِّ، عَنْ أَبِي سِنَانٍ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ الأَقْرَعَ بْنَ حَابِسٍ، سَأَلَ النَّبِيَّ صلى الله عليه وسلم فَقَالَ يَا رَسُولَ اللَّهِ الْحَجُّ فِي كُلِّ سَنَةٍ أَوْ مَرَّةً وَاحِدَةً قَالَ " بَلْ مَرَّةً وَاحِدَةً فَمَنْ زَادَ فَهُوَ تَطَوُّعٌ " . قَالَ أَبُو دَاوُدَ هُوَ أَبُو سِنَانٍ الدُّؤَلِيُّ كَذَا قَالَ عَبْدُ الْجَلِيلِ بْنُ حُمَيْدٍ وَسُلَيْمَانُ بْنُ كَثِيرٍ جَمِيعًا عَنِ الزُّهْرِيِّ وَقَالَ عُقَيْلٌ عَنْ سِنَانٍ .
Narrated Aqra' ibn Habib: Ibn Abbas said: Aqra' ibn Habis asked the Prophet (ﷺ) saying: Messenger of Allah hajj is to be performed annually or only once? He replied: Only once, and if anyone performs it more often, he performs a supererogatory act. Abu Dawud said: The narrator Abu Sinan is Abu Sinan al-Du'wail. The same has been reported by both 'Abd al-Jalil bin Humaid and Sulaiman bin Kathir from al-Zuhri. The narrator 'Uqail reported the name "Sinan
"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