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Grade : Sahih (Al-Albani)
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبِيدَةُ بْنُ حُمَيْدٍ، عَنْ أَبِي مَالِكٍ الأَشْجَعِيِّ، سَعْدِ بْنِ طَارِقٍ عَنْ كَثِيرِ بْنِ مُدْرِكٍ، عَنِ الأَسْوَدِ، أَنَّ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ، قَالَ كَانَتْ قَدْرُ صَلاَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي الصَّيْفِ ثَلاَثَةَ أَقْدَامٍ إِلَى خَمْسَةِ أَقْدَامٍ وَفِي الشِّتَاءِ خَمْسَةَ أَقْدَامٍ إِلَى سَبْعَةِ أَقْدَامٍ .
Narrated Abdullah ibn Mas'ud: The extent of the shadow when the Messenger of Allah prayed (the noon prayer) was three to five feet in summer and five to seven feet in winter
"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