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Grade : Sahih (Al-Albani)
حَدَّثَنَا هَنَّادُ بْنُ السَّرِيِّ، عَنْ وَكِيعٍ، عَنْ سَعِيدِ بْنِ زِيَادٍ، عَنْ زِيَادِ بْنِ صُبَيْحٍ الْحَنَفِيِّ، قَالَ صَلَّيْتُ إِلَى جَنْبِ ابْنِ عُمَرَ فَوَضَعْتُ يَدَىَّ عَلَى خَاصِرَتَىَّ فَلَمَّا صَلَّى قَالَ هَذَا الصَّلْبُ فِي الصَّلاَةِ وَكَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَنْهَى عَنْهُ .
Narrated Abdullah ibn Umar: Sa'id ibn Ziyad ibn Subayh al-Hanafi said: I prayed by the side of Ibn Umar and I put my hands on my waist. When he finished his prayer, He said: This is a cross in prayer; the Messenger of Allah (ﷺ) used to forbid 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