This is authentic .

Is reciting surah mulk every night for the purpose of decreasing the torment of the grave a right thing to do.As i heard that the scholars do not agree if its an authentic sunnah.

Torment and Blessing in the Grave | January 28, 2014 4:47 am
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When a person dies we burry him in the graveyard and we beleive that what ever punishment he is supposed to get he or she will get it in the grave. the religion who burn their people after death and throw their remains in the water, where they will receive their punishment of grave since there was no grave?
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I’ve read from Ibnul Qayyim (rh) that if you violate against the rights of a muslim then in fact you have violated against two rights. 1) against the right of Allah 2) the right of your brother. Concerning Allahs right you have to repent sincerely and concerning your brother you have to restore his rights. So If I repent to Allah sincerely but my brother won’t forgive me then is it correct to say that I have to repay him in the akhira with my hassanat but besides that Allah won’t punish me additionally (wether in the grave or in hell) since at least I repented to HIM (swt) concerning HIS (swt) right?