Islamic Manual

The characteristics of the letters (sifat)

The qualities of sound that distinguish letters sharing a makhraj: necessary and occasional, and the five pairs and seven single qualities among the necessary ones.

Some letters share the same makhraj: the same spot where their sound is made. So what makes them sound different from each other? Their sifat: special sound-qualities like being soft, hard, or bouncy.

Take qalqalah as an example. The letters ق ط ب ج د have a little bounce or echo in their sound when they are sakin (still, with no vowel), like a small knock. That bounce is their sifah, and it's part of reciting them correctly.

Sifat are the qualities through which letters are articulated: the features that let one letter be told apart from another even when both share the same makhraj. Sifat are of two kinds: necessary sifat, always present in a letter and inseparable from it (remove them and the letter itself is gone), and occasional sifat, whose absence leaves the letter intact but diminishes its beauty and strength.

The necessary sifat are further divided into contradictory ones, which have an opposite, and non-contradictory ones, which do not.

The five contradictory pairs (each letter carries one from every pair)
Quality LettersIts opposite
Hams (a weak, breathy sound) ت ث ح خ س ش ص ف: 10 letters (with ک and ه also counted by some)Jahr: a strong, full sound. Every other letter.
Shiddah (a hard, blocked sound) ج ب ت د ط ق ک پ: 8 lettersRukhwah: a soft, continuing sound. 16 letters, including ا ث ح خ ذ ز س ش ص ض ظ غ ف و ہ ی. Tawassut sits between the two: ر ع ل م ن, neither fully blocked nor fully continuing.
Isti'laa (the tongue rises) خ ص ض ط ظ غ ق: 7 letters, pronounced heavier and fullerIstifaal: the tongue stays low. All the remaining letters, pronounced lighter.
Itbaq (the middle of the tongue presses up) ص ض ط ظ: 4 lettersInfitah: the tongue does not press up. All the remaining letters.
Izlaq (a sliding, easy sound from the tongue or lip edges) ب ر ف ل م ن: 6 lettersIsmaat: a heavier sound, not from the edges. All the remaining letters.

Tawassut is not treated as a separate, sixth quality; it is a middle state between shiddah and rukhwah, mentioned alongside them for completeness.

The seven non-contradictory qualities (each found in only a few letters)
Quality LettersWhat it sounds like
Safir (whistling) ص ز سA sharp, whistle-like sound.
Qalqalah (a bounce) ق ط ب ج دA slight vibration or echo when the letter is sakin.
Leen (softness) و یPronounced so softly, when sakin after a matching vowel, that the sound can be drawn out easily.
Inhiraf (deviation) ل رFor lam, the sound shifts to the edge of the tongue; for ra, it shifts toward the back of the tongue, near lam's own point.
Takrir (repetition) ر onlyA slight repeating vibration, one to be careful not to overdo, so it doesn't sound like several ra's instead of one.
Tafashi (spreading) ش onlyThe sound spreads out inside the mouth.
Istitalah (elongation) ض onlyThe sound stretches from its articulation point toward the end, so the point of articulation itself feels extended.

Ṣifāt are the qualities of articulation that distinguish letters sharing a single makhraj. They fall into two classes: ṣifāt lāzimah (necessary), inseparable from the letter, without which the letter ceases to be itself, and ṣifāt ʿāriḍah (occasional), whose absence leaves the letter's identity intact while diminishing its beauty and force. The necessary ṣifāt subdivide further into mutaḍāddah (contradictory, each with an opposite) and ghayr mutaḍāddah (non-contradictory, with no opposite).

The five contradictory pairs of ṣifāt
Quality LettersIts opposite
Hams: weakening of the sound, allowing breath to continue ت ث ح خ س ش ص ف (ten letters by the fuller count)Jahr: the sound is cut off firmly and strongly at the makhraj. Every letter not counted among the mahmūsah.
Shiddah: the sound hardens and the breath is immediately blocked ج ب ت د ط ق ک پ (eight letters)Rukhwah: the sound stays soft and the breath continues. Sixteen letters: ا ث ح خ ذ ز س ش ص ض ظ غ ف و ہ ی. Tawassuṭ (ر ع ل م ن) sits between the two, combining some hardness with some softness; the source does not count it as a separate, sixth quality, precisely because it is a blend of shiddah and rukhwah rather than something outside them.
Istiʿlāʾ: the tongue rises toward the palate, deepening the sound خ ص ض ط ظ غ ق (seven letters)Istifāl: the tongue does not rise, keeping the sound lighter. All letters other than the mustaʿliyah.
Iṭbāq: the middle of the tongue presses against the palate ص ض ط ظ (four letters)Infitāḥ: the middle of the tongue does not press against the palate, keeping the sound more open. All letters other than the muṭbaqah.
Izlāq: articulated from the edges of the tongue or lips, making pronunciation fluid ب ر ف ل م ن (six letters); the labial ones (b, f, m) from the lip edges, the rest from the tongue edgesIṣmāt: not articulated from those edges, and heavier on the tongue as a result. All letters other than the mudhlaqah.

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