Narrated from Abdullaah Ibn Mas’ood (radiyallaahu-anhu) who said: ”Whoever recites [تَبَارَكَ الَّذِي بِيَدِهِ الْمُلْكُ ] [i.e. Soorah al-Mulk] every night, Allaah will protect him from the punishment of the grave. And at the time of the Messenger of Allaah (sallal-laahu-alayhi-wasallam) we used to call it [ٱلْمَانِعَةُ – i.e. something that protects]. And indeed it is a Soorah in the Book of Allaah that whoever recites it every night has done very well”.
[This Hadeeth was graded Hasan by Imaam Albaani (rahimahullaah) in ‘Saheeh At-Targheeb Wat-Tarheeb Vol 2. Page 193. Number 1475. Publisher (Maktabah Al-Ma’aarif’ 1st Ed 1421 (Year 2000)]