Al-Musabbihat (Arabic: الْمُسَبِّحَاتِ) are those suras of the Quran that begin with statements of Allah's glorification: 'Subhana', 'Sabbaha', and 'Yusabbihu'.
According to Islamic scholar Muhammad Shafi Deobandi (1897–1976) the collective name of the series Al-Musabbihat refers to the following five or seven Surahs: Sometime it also includes: Among the first five Surahs, the first three, namely Al-Hadid, Al-Hashr and As-Saff commence with the past perfect tense 'sabbaha' "purity has been proclaimed" whilst the last two, namely Al-Jumu'ah and At-Taghabun commence with the imperfect tense yusabbihu [purity is proclaimed].
This implies that the purity of God should be declared at all times, the past, the present and the future.
[4] According to Hadith Muhammad would recite the Al-Musabbihat before he went to sleep and said: "Indeed there is an Ayah in them that is better than one thousand Ayat.
"[5] Ibn Kathir commented that this verse referred to is "Huwal awwallu wal aakhiru wazzaahiru wal baatinu wahuwa bi-kulli shai-in aleem."