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Grade : Sahih (Al-Albani)
حَدَّثَنَا مُحَمَّدُ بْنُ سُلَيْمَانَ الأَنْبَارِيُّ، أَنَّ عَبْدَ الْمَلِكِ بْنَ عَمْرٍو، حَدَّثَهُمْ عَنْ دَاوُدَ بْنِ قَيْسٍ، قَالَ حَدَّثَنِي سَعْدُ بْنُ إِسْحَاقَ، عَنْ أَبِي سَعِيدٍ الْمَقْبُرِيِّ، حَدَّثَنِي أَبُو ثُمَامَةَ الْحَنَّاطُ، أَنَّ كَعْبَ بْنَ عُجْرَةَ، أَدْرَكَهُ وَهُوَ يُرِيدُ الْمَسْجِدَ أَدْرَكَ أَحَدُهُمَا صَاحِبَهُ قَالَ فَوَجَدَنِي وَأَنَا مُشَبِّكٌ بِيَدَىَّ فَنَهَانِي عَنْ ذَلِكَ وَقَالَ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا تَوَضَّأَ أَحَدُكُمْ فَأَحْسَنَ وُضُوءَهُ ثُمَّ خَرَجَ عَامِدًا إِلَى الْمَسْجِدِ فَلاَ يُشَبِّكَنَّ يَدَيْهِ فَإِنَّهُ فِي صَلاَةٍ " .
Narrated Ka'b ibn Ujrah: AbuThumamah al-Hannat said that Ka'b ibn Ujrah met him while he was going to the mosque; one of the two (companions) met his companion (on his way to the mosque) And he met crossing the fingers of my both hands. He prohibited me to do so, and said: The Messenger of Allah (ﷺ) has said: If any of you performs ablution, and performs his ablution perfectly, and then goes out intending for the mosque, he should not cross the fingers of his hand because he is already in prayer
"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