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Grade : Sahih (Abu Ghuddah)
أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سُفْيَانَ، وَشُعْبَةَ، قَالاَ حَدَّثَنَا حَبِيبُ بْنُ أَبِي ثَابِتٍ، عَنْ أَبِي الْعَبَّاسِ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، قَالَ جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم يَسْتَأْذِنُهُ فِي الْجِهَادِ فَقَالَ " أَحَىٌّ وَالِدَاكَ " . قَالَ نَعَمْ . قَالَ " فَفِيهِمَا فَجَاهِدْ " .
It was narrated that 'Abdullah bin 'Amr said:"A man came to the Messenger of Allah (ﷺ) and asked him for permission to go for Jihad. He said: 'Are your parents alive?' He said: 'Yes.' He said: 'Then strive for their sake
"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