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حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ وَزُهَيْرُ بْنُ حَرْبٍ - وَاللَّفْظُ لِزُهَيْرٍ - قَالاَ حَدَّثَنَا يَحْيَى - وَهُوَ الْقَطَّانُ - عَنْ عُبَيْدِ اللَّهِ أَخْبَرَنِى نَافِعٌ عَنِ ابْنِ عُمَرَ أَنَّ رَسُولَ اللَّهِ -صلى الله عليه وسلم- عَامَلَ أَهْلَ خَيْبَرَ بِشَطْرِ مَا يَخْرُجُ مِنْهَا مِنْ ثَمَرٍ أَوْ زَرْعٍ.
It was narrated from Ibn 'Umar that the Messenger of Allah (s.a.w) made a contract with the people of Khaibar for half of the fruit or crops produced.
"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