Ikhfa covers more letters than the other three noon rules put together, fifteen of the twenty-eight, so you will meet it on almost every line. It is also the rule that takes longest to sound natural, because it sits halfway between saying the noon and dropping it.

What "hiding" means in practice

With izhar, the tongue touches its usual place for noon and you hear a clear "n". With idgham, the noon vanishes into the next letter. Ikhfa is in between. Your tongue moves toward the next letter instead of touching for the noon, and the "n" quality comes only through your nose while it gets there.

Try it with أَنْتُمْ. Say an-tum slowly with a clear n, and you will feel your tongue touch the gum. Now say it again, but let your tongue go straight toward the ت position while you hum through your nose for two counts. That second version is ikhfa.

The 15 letters of ikhfa

ص ذ ث ك ج ش ق س د ط ز ف ت ض ظ

The classical way to memorise them is the line from Tuhfat al-Atfal, where each word begins with one of the letters:

صِفْ ذَا ثَنَا كَمْ جَادَ شَخْصٌ قَدْ سَمَا ... دُمْ طَيِّبًا زِدْ فِي تُقًى ضَعْ ظَالِمَا

An easier method for most students: learn the six izhar letters, the six idgham letters and the one iqlab letter. Everything left is ikhfa.

Examples from the Quran

Three levels of ikhfa

The closer the next letter is to the place of noon, the more the noon is hidden. Teachers usually describe three levels:

• Strongest: before ت د ط, which are made right next to the noon. The noon is almost completely absorbed.
• Weakest: before ق ك, which are made far back in the mouth. A little more of the noon's character remains.
• Middle: the remaining ten letters.

You do not need to measure these consciously as a beginner. If your tongue goes toward the next letter, the right level tends to happen by itself.

Heavy and light ghunnah

This is where good ikhfa is separated from average ikhfa. Five of the ikhfa letters are heavy: ص ض ط ظ ق. Before them, the ghunnah takes on that heaviness, the mouth opens a little more and the sound is deeper, as in مِنْ قَبْلِ or مِنْ طِينٍ. Before the light letters the ghunnah stays light, as in مِنْكُمْ. Reading every ikhfa with the same flat hum is one of the first things a teacher will adjust.

Mistakes we hear most

• Touching the tongue for a full noon, which turns ikhfa into izhar.
• Dropping the ghunnah, which turns it into idgham without ghunnah.
• Turning the noon into an "ng" sound, like the end of the English word "sing", especially before ق and ك. The back of the tongue should not rise for the ghunnah.
• Rushing. The ghunnah is two counts. When reading quickly, people often give it half that.
• Adding a vowel after the ghunnah, so أَنْتُمْ becomes an-a-tum.

How to practise

Pick the right-hand column of the table above and read each word slowly, focusing only on keeping your tongue off the noon position. Then read the tanween column. Once those feel natural, read Surah an-Naba or al-Mursalat, which are full of ikhfa, and listen for heavy versus light ghunnah. Recording yourself and comparing it with a well-known reciter such as Sheikh al-Husary, who reads slowly and precisely, is very useful.

Ikhfa is easier to hear than to read about. In our one-on-one Quran with Tajweed lessons, the teacher models each letter group and listens to you repeat it, which is usually the fastest way to make it automatic. If you are still working on the basics, start with our overview of the four noon sakinah rules.