Tafkheem and Tarqeeq: Heavy and Light Letters in Tajweed Explained

Tafkheem and tarqeeq are the two ways an Arabic letter can fill the mouth: tafkheem (heaviness or fullness, where the back of the tongue rises towards the roof of the mouth and the sound echoes through the whole mouth) and tarqeeq (lightness or thinness, where the tongue stays low and the sound is slim). Every letter is read one way or the other, and a small group change from heavy to light depending on their vowel. Everything below follows the reading of Hafs 'an 'Asim; other qira'at (transmitted readings) differ in a few of the details, especially around the laam and the raa.

What heaviness actually does in the mouth

Say the English words "car" and then "key". In the first the back of the tongue lifts and the sound feels big; in the second the tongue sits forward and the sound feels narrow. In a heavy letter the rear of the tongue rises towards the soft palate, a property the books call isti'la (elevation), and the sound of the letter fills the mouth. In a light letter the tongue stays down, called istifal (lowering), and the sound stays thin.

Heaviness is not loudness. A whispered ص is still heavy; a shouted س is still light. Our guide to the seventeen makharij explains where each letter is formed; tafkheem and tarqeeq describe what the rest of the tongue is doing at the same time.

The seven letters that are always heavy

Seven letters are heavy in every position: خ, ص, ض, غ, ط, ق and ظ. Students remember them through the phrase khussa daghtin qiz (خُصَّ ضَغْطٍ قِظْ), three short words whose consonants are exactly these seven. They are known as the isti'la letters because raising the back of the tongue is part of how they are produced, and none of them can be read light without becoming a different letter.

Four of them, ص, ض, ط and ظ, carry an extra property called itbaq (closing, where the tongue also presses up towards the palate along its length), and these are the heaviest of the group. The other three, خ, غ and ق, are heavy but a shade less so. Our article on the sifaat of the letters sets both properties in their wider family.

Degrees of heaviness

The same ق is fuller in qaala than in qeela, and most books describe a scale that depends on the vowel the letter carries. The version most commonly taught runs from fullest to lightest:

1. The letter carries fathah (the short "a" vowel) and is followed by alif, as in qaala or as-saadiqeen.
2. The letter carries fathah with no alif after it, as in khalaqa.
3. The letter carries dammah (the short "u" vowel), as in qul.
4. The letter is sakin (carries no vowel), where many teachers say it takes its weight from the vowel before it.
5. The letter carries kasrah (the short "i" vowel), as in qeela, where it is still heavy but at its lightest.

Some teachers collapse this into three levels, some place the sakin case differently, and some simply demonstrate without numbering. Take the ordering your own teacher gives you and match the sound rather than the list.

Letters that are sometimes heavy

Three letters change according to their surroundings.

Raa (ر). Heavy with fathah or dammah, light with kasrah, and when it carries no vowel it usually follows the vowel before it. There are exceptions on both sides, which is why this letter has an article of its own on the rules of raa.

The laam in the name of Allah. This laam is read heavy when the letter before it carries fathah or dammah, and light when that letter carries kasrah. So in Allahu, qaalallahu and rasoolullah the laam is full, while in bismillah and lillah it is thin. In Hafs no other laam is read heavy; the laam of ordinary words is light whatever sits next to it.

Alif. The long alif has no character of its own; it takes on whatever the letter before it is doing. After a heavy letter, as in saabireen, the alif is heavy. After a light letter, as in kaana, it is light. The alif is never the cause of heaviness, only a mirror of it.

Heaviness belongs to the letter, not to the word: a heavy neighbour gives a light letter no permission to become heavy.

Everything else is light, and the fault that spoils it

The remaining letters of the alphabet are read light in every position. That includes the throat letters ح, ع and ه, which beginners often feel should be heavy because they are deep; deep is not the same as heavy, and the back of the tongue stays down for all of them.

The error teachers correct most often is not a heavy letter read light. It is a light letter read heavy because a heavy one sits nearby. In mustaqeem the س and ت are light even though ق follows two letters later. In khalaqa the laam sits between خ and ق and stays completely thin. In as-salaah the laam after ص is light, and so is the laam in at-talaaq after ط. Once the tongue has risen for a heavy letter it wants to stay up, and the reader must bring it down again for the next letter. This is among the most common Tajweed mistakes in confident readers.

The reverse fault, a ص thinned to س or a ق to ك, usually comes from the reader's first language and is corrected the same way, by contrast drills.

Practice pairs that train the ear

The fastest way to feel the difference is to read pairs of words that differ only in the heavy letter, slowly and with the gap exaggerated at first.

• ص against س: salaah (prayer, with ص) against salaam (peace, with س). The first should feel as if the sound has spread across the roof of the mouth, the second like a whistle at the front teeth.
• ط against ت: tayyib (good, with ط) against tawwaab (ever-relenting, with ت), or the light ت that opens Surah At-Tin (95:1) against the ط of toor in the ayah that follows.
• ق against ك: qalb (heart) against kalb (dog), the pair every teacher uses, and qul (say) against kul (eat).

If both members of a pair sound the same in your recording, the heavy letter is being thinned; if both sound heavy, the light one is being dragged upward. Readers who confuse the pairs by ear as well as by mouth will find our article on commonly confused Arabic letters a helpful companion.

Frequently asked questions

Is heaviness the same as pronouncing a letter loudly?

No. Tafkheem is about the position of the back of the tongue and the space it creates, not about volume. A heavy letter read quietly keeps its fullness and a light letter read loudly stays thin. Teachers sometimes ask students to whisper a page so that volume cannot substitute for it.

Why does my teacher say ق is heavy but less heavy than ط?

Because ط carries both isti'la and itbaq, while ق carries isti'la alone. Books describe the four itbaq letters as the fullest of the seven, with خ, غ and ق a step below. It is a difference of degree, so do not lighten ق in trying to reflect it.

Is the laam heavy anywhere apart from the name of Allah?

In the reading of Hafs 'an 'Asim, no. The laam of ordinary words is light even directly after ص, ط or ظ. Some other qira'at do read certain laams heavy in that position, which is one reason the name of the reading matters when you compare recordings.

How can I tell whether my heavy letters are heavy enough?

Record a pair such as qalb and kalb and play both back without looking at the text. If you cannot tell which is which, the contrast is missing. Better still, read the pair to a teacher, because most readers hear what they intended rather than what they actually said.

Does heaviness change how long a letter is held?

Not by itself. Length is governed by the rules of madd and by sukoon, and a heavy letter is held for exactly as long as a light one in the same position. Readers sometimes lengthen heavy letters because the fuller sound feels as if it needs more time; notice that habit early.

Get the weight of every letter checked in one sitting

Whether the right letters are heavy and the rest light is the first thing our teachers listen for in a new student. The Tajweed course takes tafkheem and tarqeeq letter by letter with drills like the pairs above, and you can begin with a free first class on a private video call, where the teacher will tell you plainly which letters are already right and which need work.