There is no basis for the so-called seven munjiyaat (things that could save a person from the Hellfire)
Question

                What are the seven munjiyaat?.
Praise be to Allah.
      The phrase “the seven munjiyat” is given to seven soorahs 
      or verses of the Holy Qur’aan, which were chosen by some ignorant people 
      and given this name. There is no basis for that in the Book of Allah or 
      the Sunnah of His Messenger (blessings and peace of Allah be upon him); 
      rather the entire Qur’aan is healing, guidance and salvation for the one 
      who adheres to it. 

    The scholars of the Standing Committee for Issuing Fatwas 
    were asked: Some students came to Dar al-Hadeeth in Madeenah al-Munawwarah 
    with a paper which listed the soorahs that could save a person from Hellfire 
    (munjiyaat), which included al-Kahf, al-Sajdah, Ya-Seen, Fussilat, 
    al-Dukhaan, al-Waaqi‘ah, al-Hashr and al-Mulk. Many copies of it have been 
    distributed. Is there any evidence for singling out the soorahs in this way 
    and giving them this name? 

    They replied: 

    All the soorahs and verses of the Holy Qur’aan are healing 
    for what is in the hearts, and they are guidance and mercy for the world; 
    for the one who clings to it and follows its guidance, it is salvation from 
    kufr, misguidance and painful torment. The Messenger of Allah (blessings and 
    peace of Allah be upon him) explained in his words, deeds and what he 
    approved of that ruqyah is permissible, but there is no proof from him that 
    he singled out these eight soorahs or called them al-munjiyaat; rather it is 
    proven that he used to seek refuge for himself with Allah by reciting the 
    three Mu‘awwidhaat: Qul Huwa Allaahu Ahad, Qul a‘oodhu bi Rabbi’l-Falaq and 
    Qul A‘oodhu bi Rabbi’l-Naas [i.e., the last three soorahs of the Qur’aan], 
    reciting them three times and blowing into his palms after each recitation 
    when going to sleep, then wiping his face and whatever he could reach of his 
    body. Abu Sa‘eed recited al-Faatihah as a ruqyah for the chief of a tribe of 
    kuffaar who had been stung, and he recovered by Allah’s leave, and the 
    Prophet (blessings and peace of Allah be upon him) approved of that. He also 
    approved of reciting Aayat al-Kursiy when going to sleep, and said that if a 
    person recited it, no devil would come near him that night. The one who 
    singles out the soorahs mentioned in the question as munjiyaat is ignorant 
    and an innovator, and the one who compiled them in this order, separate from 
    other soorahs in the Qur'aan, in the hope of salvation or protection or 
    seeking blessing from them, has done a bad deed and committed sin thereby, 
    because he has gone against the order in which they appear in the ‘Uthmaani 
    Mushaf on which the Sahaabah (may Allah be pleased with them) were agreed. 
    He has forsaken most of the Qur'aan and singled out part of it which was not 
    singled out by the Messenger of Allah (blessings and peace of Allah be upon 
    him) or by any of his Companions. Based on that, it should be prevented from 
    being distributed and what has been printed of these papers should be 
    disposed of, so as to denounce and remove the evil.

    End quote. 

    Fataawa al-Lajnah al-Daa’imah 
    (2/478) 

    Shaykh Bakr ibn ‘Abd-Allah Abu Zayd (may Allah preserve him) 
    said in Tasheeh al-Du’aa’ (p. 287): The munjiyat are eight soorahs: 
    al-Kahf, al-Sajdah, Ya-Seen, Fussilat, al-Dukhaan, al-Hashr, and al-Mulk. 

    Firstly: Describing or calling these soorahs al-munjiyaat is 
    something for which there is no basis. 

    Secondly: Singling them out for recitation in some situation 
    or at some time or in some place is something for which there is no basis. 
    Hence it is not permissible to recite them like this as an act of worship, 
    because there is no evidence to single them out in this manner at all. End 
    quote. 

    This applies to these soorahs and verses which are claimed to 
    be munjiyaat. 

    And Allah knows best.