Though placed first, Al-Fatiha is generally counted a Meccan revelation and is often described as a summary of the whole Quran, holding praise, theology, and petition in seven verses. The traditional division of surahs into Meccan (revealed before the emigration to Medina) and Medinan is a classification of the exegetical tradition; modern historical-critical scholarship debates the precise dating and sequence of revelation. In prayer, the worshipper who cannot recite it is held not to have a valid prayer in most schools, which makes it the single most memorised text in Islam. Its final petition to be kept from the path of 'those who have earned anger' and 'those who have gone astray' has been the subject of extensive commentary.
Manuscript evidence bears on how fixed this most-recited of texts actually is. Early Quranic parchments such as the Sana'a palimpsest, and differences among the canonical recitation traditions (qira'at), Hafs, used through most of the Muslim world, and Warsh, dominant across North and West Africa, show minor variation in orthography and vocalisation rather than in the wording worshippers hear, part of why the text has drawn less textual-critical controversy than its theology has drawn exegetical attention, which centres on the closing verses: classical exegesis, including al-Tabari and later commentators, glossed "those who have earned anger" and "those who have gone astray" as references to Jews and Christians respectively, a reading with a long history in tafsir but one many modern scholars, Muslim and non-Muslim, treat as a later interpretive layer rather than a meaning fixed by the verse itself, since the Arabic names no group. Whether recited aloud or silently depends on which of the five daily prayers is in progress, a rule the Fatiha shares with the surah that follows it in each rak'a.