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

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.