All praise is due to Allah, peace and blessings be upon prophet Muhammad and upon all his family and companions.
The Hadeeth narrated about the reward for reciting Surat ”Al-Mulk” is corrected by some scholars of Hadeeth. It is the one narrated by Abu Baker (may Allah be pleased with him) and it reads: (A chapter of the Quran, thirty verses, interceded for its reciter until he was forgiven:(Blessed is He in Whose hand is [all] sovereignty).Narrated by Al-Tirmidi (2891) in a sound Hadeeth, was deemed rigorously authentic by Ibn Al-Molakin in the book [Al-Badir Al-Moneer, vol.3/pp.561).]” Ibn Hajar said in the book: [Altalkhiss Alhabeer” vol.1/pp.382)] this Hadeeth has another sound narration. On the authority of Abdullah Ibn Masood: “Whoever recites Surat Al-Mulk every night is protected by Allah from punishment of the grave. At the time of the Prophet (PBUH), we used to name it “Al-Maane`ah”, and the one who recites it every night is duely rewarded” {Al-Nassa`i}.
This reward is received by whoever recites this chapter in honor of Allah and expects recompense from none but Him alone. And Allah The Almighty Knows Best.