Idgham in Tajweed: Assimilation With or Without Ghunnah

Idgham is an important rule of Tajweed. It refers to the assimilation or merging of a sound into the letter that follows it. This rule allows smoother recitation, provided that the letters, articulation points and characteristics are respected.

This article focuses only on Idgham. To study all the rules of Noon Sakinah and Tanween, read: Noon Sakinah and Tanween in Tajweed.

What is Idgham?

The word Idgham means to insert or merge. In Tajweed, it means merging one letter or sound into the following letter according to precise rules.

Idgham does not simply mean reading faster. It means reciting correctly while respecting the transition between sounds.

The letters of Idgham with Noon Sakinah and Tanween

When Noon Sakinah or Tanween is followed by specific letters, Idgham may apply. These letters are grouped in the word:

يَرْمَلُونَ

They are:

ي ر م ل و ن

Idgham with Ghunnah

Idgham with Ghunnah occurs with the letters:

ي ن م و

They can be memorized with the word:

يَنْمُو

In this case, the sound of Noon or Tanween merges into the following letter with nasalization.

Audio example of Idgham with Ghunnah

وَمَا أَنزَلَ اللَّـهُ مِنَ السَّمَاءِ مِن مَّاءٍ فَأَحْيَا بِهِ الْأَرْضَ

Idgham without Ghunnah

Idgham without Ghunnah occurs with the letters:

ل ر

In this case, the assimilation occurs without nasalization. A common mistake is to add Ghunnah when it should not be pronounced.

When does Idgham not apply?

In the rules of Noon Sakinah and Tanween, Idgham usually applies between two words. If Noon Sakinah is inside the same word as the following letter, Idgham does not apply in known examples such as:

• الدُّنْيَا;
• بُنْيَانٌ;
• قِنْوَانٌ;
• صِنْوَانٌ.

Complete and incomplete assimilation

Idgham can be complete or incomplete.

• Complete assimilation: no audible trace of the first letter remains.
• Incomplete assimilation: one characteristic of the first letter remains audible.

Idgham Mutamathilan — assimilation of identical letters

Idgham Mutamathilan occurs when two identical letters meet. The first has sukoon and the second has a vowel. The first letter is assimilated into the second, which carries a shaddah.

Audio examples

Idgham Mutajanisan — assimilation of similar letters

Idgham Mutajanisan occurs when two letters share the same articulation point but have different characteristics. The first is sakin and the second has a vowel.

Audio examples

Idgham Mutaqariban — assimilation of close letters

Idgham Mutaqariban occurs when two letters have close articulation points. The merging depends on the relationship between the letters and the transmitted recitation.

Audio examples

Common mistakes in Idgham

• Pronouncing Noon too clearly when it should be assimilated.
• Adding Ghunnah in Idgham without Ghunnah.
• Omitting Ghunnah in Idgham with Ghunnah.
• Applying Idgham inside a word where it does not apply.
• Confusing complete and incomplete assimilation.
• Reading too quickly without identifying the following letter.

Why learn Idgham with a teacher?

Idgham is an oral rule. Written material helps the student understand it, but a teacher’s correction is necessary to hear the merging, Ghunnah, articulation points and transition mistakes.

Al-Dirassa offers online Tajweed courses to learn recitation rules and correct pronunciation step by step.

For a broader approach, you can also explore our online Quran courses.

FAQ — Idgham in Tajweed

What is Idgham?

Idgham is assimilation: one sound merges into the letter that follows it.

What are the letters of Idgham?

The letters are grouped in يَرْمَلُونَ: ي ر م ل و ن.

What is the difference between Idgham with and without Ghunnah?

Idgham with Ghunnah includes nasalization. Idgham without Ghunnah concerns ل and ر.

Conclusion

Idgham is an essential rule for reciting the Quran with fluency and precision. It first concerns Noon Sakinah and Tanween, but there are also advanced forms of assimilation between identical, similar or close letters.

To apply it correctly, the student must know the letters involved, distinguish Idgham with and without Ghunnah, listen to audio examples and correct recitation with a qualified teacher.