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Grade : Sahih (Al-Albani)
حَدَّثَنَا مُحَمَّدُ بْنُ كَثِيرٍ، أَخْبَرَنَا هَمَّامٌ، عَنْ قَتَادَةَ، عَنْ أَبِي الْمَلِيحِ، عَنْ أَبِيهِ، أَنَّ يَوْمَ، حُنَيْنٍ كَانَ يَوْمَ مَطَرٍ فَأَمَرَ النَّبِيُّ صلى الله عليه وسلم مُنَادِيَهُ أَنِ الصَّلاَةُ فِي الرِّحَالِ .
Narrated Usamah ibn Umayr al-Huzali: The rain was falling on the day when the Battle of Hunayn took place. The Prophet (ﷺ), therefore, commanded that the people should offer their prayer in their camps
"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