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Grade : Sahih (Al-Albani)
حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، عَنْ سُفْيَانَ، عَنْ أَبِي مَالِكٍ الأَشْجَعِيِّ، عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " لاَ غِرَارَ فِي صَلاَةٍ وَلاَ تَسْلِيمٍ " . قَالَ أَحْمَدُ يَعْنِي فِيمَا أُرَى أَنْ لاَ تُسَلِّمَ وَلاَ يُسَلَّمَ عَلَيْكَ وَيُغَرِّرُ الرَّجُلُ بِصَلاَتِهِ فَيَنْصَرِفُ وَهُوَ فِيهَا شَاكٌّ .
Abu Hurairah reported the Prophet (ﷺ) as saying:There is no loss in prayer nor in salutation. Ahmad(b. Hanbal) said: This means, I think, that you do not salute nor you are saluted by others. The loss of a man in his prayer is that a man remains doubtful about it when he finishes it
"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