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Tajweed — The Science of Quranic Recitation: Every Letter From Its Source, Every Rule in Its Place

التَّجوِيد — عِلمُ تِلَاوَةِ القُرآن: كُلُّ حَرفٍ مِن مَخرَجِه وَكُلُّ حُكمٍ فِي مَوضِعِه
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Tajweed (التَّجوِيد — correct/beautiful pronunciation; from *jawwada* — to make excellent, to perfect; the science governing correct pronunciation in Quranic recitation) is the body of rules that preserve the Quran's phonological integrity as it was recited by the Prophet and transmitted through the chain of reciters to the present day. The Quran itself commands: *'And recite the Quran with measured recitation.'* (73:4 — *wa-rattil al-quran tartila*). The tajweed rules exist because Arabic phonology includes sounds that do not exist in other languages — the emphatic letters (*isti'la'/tafkhim*), the uvular stop, the two types of 'h', the distinction between dad/za — and because small phonetic changes can alter meaning (the letter *dad* vs *za'* in classical Arabic changes entire word meanings).

The Makharij al-Huruf (Articulation Points)

Classical tajweed scholars divided the Arabic alphabet’s articulation points into five regions:

  1. Al-Jawf (the cavity — throat/chest): The elongated vowels (alif, waw, ya’ in their madd forms)
  2. Al-Halq (the throat): Six letters — hamza, ha, ‘ayn, ha, ghayn, kha — produced at three positions (deepest throat to top of throat)
  3. Al-Lisan (the tongue): Most Arabic letters — the tongue’s tip, blade, sides, and back each produce distinct sounds
  4. Al-Shafa (the lips): Ba, mim, waw, fa — labial and labiodental sounds
  5. Al-Khayshum (the nasal passage): Ghunna (nasalization) — the nasal resonance applied to nun and mim in specific contexts

Core Rules Every Reciter Must Know

Idgham (assimilation): When nun sakin (ن°) or tanwin is followed by certain letters, the nun merges into the following letter. Six letters cause idgham: ya’, ra’, mim, lam, waw, nun (مرنولين). Two of them (waw and ya’) require a ghunna (nasal resonance); the other four do not.

Ikhfa’ (concealment): When nun sakin or tanwin precedes 15 specific letters, the nun is partially concealed — neither fully pronounced nor fully assimilated, held with nasal resonance for two counts.

Qalb (transformation): When nun sakin or tanwin precedes ba, the nun transforms into a mim sound with ghunna.

Izhar (clear articulation): When nun sakin or tanwin precedes the six throat letters, the nun is clearly pronounced without any nasalization.

Madd (elongation): The elongation of vowel sounds. Basic madd is two counts; specific contexts require 4 or 6 counts. The madd rules regulate the length of each vowel sound in recitation.

The Seven Qira’at

The Quran was revealed in seven dialects/modes (ahruf), and there exist ten mutawatir (mass-transmitted) qira’at (recitation modes) — each named for a renowned reciter from the early generations. The most common in the Muslim world today is the riwayat Hafs ‘an ‘Asim (the transmission of Hafs from his teacher ‘Asim). The Bohra community historically uses riwayat Warsh in certain recitations as part of the Fatimid connection to North African practices.

See also: Quran Sciences, Nuzul Al Quran, Fada Il Al Quran, Isnad, Adhkar, Adab Al Ilm

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