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Grade : Sahih (Al-Albani)
حَدَّثَنَا مُسَدَّدٌ، وَيَحْيَى بْنُ مَعِينٍ، قَالاَ حَدَّثَنَا يَحْيَى، عَنْ مَالِكٍ، عَنِ الْفُضَيْلِ، عَنْ عَبْدِ اللَّهِ بْنِ نِيَارٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَ يَحْيَى أَنَّ رَجُلاً، مِنَ الْمُشْرِكِينَ لَحِقَ بِالنَّبِيِّ صلى الله عليه وسلم لِيُقَاتِلَ مَعَهُ فَقَالَ " ارْجِعْ " . ثُمَّ اتَّفَقَا فَقَالَ " إِنَّا لاَ نَسْتَعِينُ بِمُشْرِكٍ " .
A'ishah said (this is the version of narrator Yahya). A man from the polytheists accompanied the Prophet (ﷺ) to fight along with him. He said "Go back. Both the narrators (Musaddad and Yahya) then agreed. The Prophet said "We do not want any help from a polytheist."
"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