The blessings of Du’â (supplication)

The Beloved Prophet şallAllāhu álayhi wa sallam has said,  

The people of my Ummah will enter their graves carrying the burden of their sins but when they rise [the day of judgement], they will be sinless because their sins would have been forgiven due to the Du’â of believers.[1]

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[1] Imâm al-Tabarânī, Mu’jam al-Awsat, vol. 1, pp. 509, Hadīth 1879