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Grade : Sahih (Al-Albani)
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، عَنِ الأَعْمَشِ، عَنْ ذَرِّ بْنِ عَبْدِ اللَّهِ الْهَمْدَانِيِّ، عَنْ يُسَيْعٍ الْكِنْدِيِّ، عَنِ النُّعْمَانِ بْنِ بَشِيرٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " إِنَّ الدُّعَاءَ هُوَ الْعِبَادَةُ " . ثُمَّ قَرَأَ {وَقَالَ رَبُّكُمُ ادْعُونِي أَسْتَجِبْ لَكُمْ} .
It was narrated from Nu'man bin Bashir that :the Messenger of Allah (saas) said: "Indeed the supplication is the worship." Then he recited: "And your Lord said: Invoke Me, I will respond to you
"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