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Grade : Sahih (Abu Ghuddah)
أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، عَنْ يَزِيدَ بْنِ زُرَيْعٍ، قَالَ حَدَّثَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم صَلَّى بِإِحْدَى الطَّائِفَتَيْنِ رَكْعَةً وَالطَّائِفَةُ الأُخْرَى مُوَاجِهَةُ الْعَدُوِّ ثُمَّ انْطَلَقُوا فَقَامُوا فِي مَقَامِ أُولَئِكَ وَجَاءَ أُولَئِكَ فَصَلَّى بِهِمْ رَكْعَةً أُخْرَى ثُمَّ سَلَّمَ عَلَيْهِمْ فَقَامَ هَؤُلاَءِ فَقَضُوا رَكْعَتَهُمْ وَقَامَ هَؤُلاَءِ فَقَضُوا رَكْعَتَهُمْ .
It was narrated from Salim from his father, that:The Messenger of Allah (ﷺ) led one of the two groups in praying one rak'ah while the other group was facing the enemy, then they moved away and took the place of the others, and the others came and he led them in praying the other rak'ah, then he said the salam and they stood up and made up the other rak'ah, and the others stood up and made up the other rak'ah
"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