What Are the Rules of Noon Sakinah and Tanween? Izhar, Idgham, Iqlab and Ikhfa Explained

If you learn only one group of tajweed rules this year, make it this one. The rules of noon sākinah and tanwīn appear on almost every line of the Qur’an — often several times — and getting them right is the difference between recitation that sounds hesitant and recitation that flows. The good news: the noon sakinah and tanween rules are only four, and each one makes sense once you hear why.

In this lesson you’ll learn what noon sākinah and tanwīn are, the four rules with their letters and examples, the classic memory aids that students have used for centuries, the exceptions that catch people out, and a short practice exercise with answers.

1What are noon sākinah and tanwīn?

Noon sākinah is a noon with no vowel — a sukūn — written نْ. It can come in the middle of a word (يَنْهَوْنَ) or at the end (مَنْ, مِنْ, عَنْ).

Tanwīn is the doubled vowel at the end of a noun — ـً ـٍ ـٌ — read as “-an, -in, -un.” It is pronounced as an extra noon sākinah, even though no noon is written. So عَلِيمٌ is read ‘alīmun. That’s why the two share the same rules.

What you do with that “n” sound depends entirely on the letter that comes right after it. That gives us four rules.

2Iẓhār — pronounce the noon clearly

When: noon sākinah or tanwīn is followed by one of the six throat letters: ء ه ع ح غ خ.

How: pronounce the noon fully and clearly, with no extra nasal hold and no pause.

Why: the throat letters are far from the tip of the tongue where noon is made, so the two sounds can’t blend.

The classic memory line from Tuḥfat al-Aṭfāl lists them from deepest to highest in the throat:

3Idghām — merge the noon into the next letter

When: noon sākinah or tanwīn at the end of a word is followed, at the start of the next word, by one of six letters gathered in the word يَرْمَلُونَ (yarmalūn): ي ر م ل و ن.

How: the noon disappears into the next letter, which is pronounced doubled. You’ll usually see a shaddah on that letter in the muṣḥaf. Idghām comes in two kinds:

Idghām with ghunnah — ي ن م و (remember “yanmū”)

The noon merges, but its nasal sound remains, held for two counts.

• مَن يَقُولُ — read “may-yaqūlu,” with ghunnah
• مِن نِّعْمَةٍ — “min-ni’matin”
• مِن مَّاءٍ — “mim-mā’in”
• مِن وَلِيٍّ — “miw-waliyyin”
• يَوْمَئِذٍ نَّاعِمَةٌ — tanwīn merging into noon

Idghām without ghunnah — ل ر

The noon merges completely, with no nasal sound at all.

• مِن رَّبِّهِمْ — “mir-rabbihim”
• هُدًى لِّلْمُتَّقِينَ — “hudal-lil-muttaqīn”
• وَيْلٌ لِّكُلِّ — “wailul-likulli”

4Iqlāb — turn the noon into a meem

When: noon sākinah or tanwīn is followed by ب — the only letter for this rule.

How: the noon is changed into a hidden meem, with ghunnah for two counts and the lips gently closed. The muṣḥaf marks it with a small meem ۢ above the noon or tanwīn.

• أَنۢبِئْهُم — inside one word
• مِنۢ بَعْدِ — across two words
• سَمِيعٌۢ بَصِيرٌ — with tanwīn

Why: saying a clear “n” and then closing your lips for “b” is awkward; the meem shares its place (the lips) with the bā’, so the change makes the recitation smooth.

5Ikhfā’ — hide the noon

When: noon sākinah or tanwīn is followed by any of the remaining fifteen letters.

How: the noon is neither fully pronounced nor merged. The tongue doesn’t touch the place of the noon; instead, it moves toward the next letter while a nasal sound (ghunnah) is held for two counts. The sound is “heavier” before heavy letters (مِن قَبْلِ) and “lighter” before light ones (أَنتُمْ).

The fifteen letters are the first letters of each word in this famous line:

• يُنفِقُونَ — before ف, inside one word
• مِن قَبْلِ — before ق, across two words (heavy)
• أَنتُمْ — before ت (light)
• عَذَابًا شَدِيدًا — tanwīn before ش
• رِيحًا صَرْصَرًا — tanwīn before ص

6The rules of noon sākinah and tanwīn at a glance

7Five common mistakes

• Adding ghunnah in iẓhār. مِنْ عِلْمٍ should have a crisp “n,” not a hum.
• Pressing the tongue in ikhfā’. If you hear a full “n,” the tongue touched the gums — that’s iẓhār, not ikhfā’.
• Pressing the lips hard in iqlāb. Close them lightly; the sound should flow, not pop.
• Forgetting tanwīn. Students apply the rules to written noons and miss the hidden noon at the end of ـًـٍـٌ.
• Merging inside a word. Remember الدُّنْيَا — never “ad-duyyā.”

8Practice exercise

Identify the rule in each example, then open the answers. Say each one aloud — slowly — before you check.

1. مِن شَرِّ مَا خَلَقَ
2. لَمْ يَكُن لَّهُ
3. كُفُوًا أَحَدٌ
4. مِنۢ بَيْنِ
5. فَمَن يَعْمَلْ
6. نَارٌ حَامِيَةٌ

All six come from the last juz of the Qur’an — al-Falaq, al-Ikhlāṣ, al-Ṭāriq, al-Zalzalah and al-Qāri’ah. Try finding more examples in the sūrahs you already know; it’s the fastest way to make these rules automatic. And if you’d like to understand what these sūrahs mean while you recite them, read our five virtues of Sūrat al-Ikhlāṣ.

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