The lam in the name of Allah is pronounced heavy (tafkheem) when the letter before it has a fathah or a dammah, and light (tarqeeq) when the letter before it has a kasrah. So you read a full, rich lam in qala Allahu and rusulu Allahi, and a thin, light lam in Bismillah and al-hamdu lillah. The same rule applies to Allahumma. It sounds simple, and it is, but the connected cases between words trip up many readers, which is why our one-to-one Tajweed lessons spend time on them with live correction.
This guide explains the rule according to Hafs ‘an ‘Asim, shows you how to handle the tricky cases where words join, and points out the pronunciation mistakes teachers hear most often.
Key takeaways
- After a fathah or dammah, the lam of Allah is heavy; after a kasrah, it is light.
- What matters is the vowel you actually pronounce before the name, not how the word looks.
- When you start your recitation with the name Allah, the lam is heavy.
- The rule applies only to Allah and Allahumma; other lams in Hafs are light.
The Rule in One Table
Scholars call the name Allah Lafz al-Jalalah, “the word of majesty.” Ibn al-Jazari summarized the rule in his famous tajweed poem: make the lam of the name of Allah heavy after a fathah or a dammah, giving ‘abdullah as his example. Everything else follows from that.
| Vowel before the name | Lam is | Examples |
|---|---|---|
| Fathah | Heavy | qala Allahu, shahida Allahu (Aal Imran 3:18) |
| Dammah | Heavy | nasru Allahi (Al-Baqarah 2:214), ‘abdu Allahi (Al-Jinn 72:19) |
| Kasrah | Light | Bismillah (Al-Fatiha 1:1), lillahi (Al-Fatiha 1:2), fi sabilillah |
| Starting with the name | Heavy | Allahu la ilaha illa huwa (Al-Baqarah 2:255) |
Many teachers add that the lam after a fathah is the strongest degree of heaviness, with the lam after a dammah slightly less full. Both are still clearly heavy.
What Tafkheem and Tarqeeq Actually Sound Like
A heavy lam is produced by raising the back of the tongue toward the roof of the mouth while the tip touches the gums behind the upper teeth. The sound becomes full and deep. The alif after it follows the lam, so it also sounds full.
A light lam is the ordinary lam you hear in most Arabic words. The back of the tongue stays low, and the alif after it is thin and open.
If you want a broader picture of heavy and light letters, our guide to mastering tafkheem and tarqeeq covers the always-heavy letters and the letters that change.
Test Yourself Before the Tricky Cases
Try the short quiz below. It includes the main rule and the connected cases explained in the next section, so you can see which ones you already know.
Lam of Allah Quiz
Test whether you can tell a heavy lam from a light one
The Tricky Cases: When Words Join
The key principle is this: look at the sound you pronounce right before the name, not at the spelling. When words are connected, the vowel before Allah can change.
A long vowel that drops
In afi Allahi shakk (Ibrahim 14:10), the word fi ends in a long ya, but when you join it to Allah the long vowel is not pronounced. You say afillahi, so the sound before the lam is a kasrah and the lam is light.
In qalu Allahumma (Al-Anfal 8:32), the long waw of qalu also drops in connection, and the vowel you hear before the lam is a dammah. The lam is heavy.
A sukun that becomes a kasrah
When a word ends in a sakin letter and the next word begins with the name Allah, the two sakin sounds cannot meet. The sakin letter usually takes a kasrah to join them:
- qul Allahumma (Aal Imran 3:26) is read qulillahumma. The lam of qul takes a kasrah, so the lam of Allahumma is light.
- ahadun, Allahu as-samad (Al-Ikhlas 112:1 to 2), when joined, becomes ahadunillahus-samad. The nun of the tanween takes a kasrah, so the lam is light.
Stopping versus joining
If you stop on ahad and then begin again with Allahu as-samad, you are starting fresh with the name, so the lam is heavy. The same ayahs can produce a heavy or a light lam depending on whether you join or stop. Both are correct as long as you follow the vowel you actually pronounce.
Which Lams This Rule Does Not Cover
This rule is specific to the name Allah and to Allahumma. It does not apply to other words that contain a lam with the same letters nearby, such as ilah (god), alladhi (who) or allati. In Hafs ‘an ‘Asim, those lams are light.
The definite article al follows its own separate rule: it is either pronounced or merged, depending on the letter after it. Our article on lam shamsiyyah and lam qamariyyah explains that distinction. Heavy and light pronunciation is also a key topic for the letter ra, which has more detailed conditions; see our guide to the rules of ra.
Other riwayat differ. Some narrations, such as Warsh, make certain other lams heavy in specific conditions. Most students first master Hafs, and you can ask about other riwayat during your free level assessment.
Common Mistakes Teachers Hear
- Rounding the lips. Turning Allah into something like “Ollah” or “Allooh” is not tafkheem. Heaviness comes from the tongue, not the lips.
- A heavy lam after a kasrah. Saying Bismillah or lillah with a deep, full lam is one of the most frequent errors, especially in fast recitation.
- A light lam after a fathah or dammah. Some readers keep every lam thin out of habit from their own language.
- Forgetting the connected cases. Readers who know the basic rule often slip on qulillahumma or ahadunillah.
- Overstretching the alif. When you read through the name, the alif after the lam is a natural madd of two counts. Only when you stop on the name does it become a madd for stopping, which may be lengthened to 2, 4 or 6 counts. Stretching it mid-recitation for emphasis changes the recitation.
How to Practice
- Listen and repeat a trusted reciter on Al-Fatiha, Ayat al-Kursi and Al-Ikhlas, which together contain clear examples of both heavy and light lams.
- Mark the name Allah on one page of your mushaf and note the vowel before each one, then recite the page slowly.
- Record yourself and listen for lip rounding or a heavy lam after a kasrah.
- Recite to a teacher. Most readers cannot hear these differences in their own voice at first. A teacher in our Tajweed rules course will catch them in seconds.
For a wider overview of how this rule fits into your recitation, see our guide on how to read the Quran with tajweed.
Frequently Asked Questions
Is the lam in Bismillah heavy or light?
Light. The ba in bismi carries a kasrah, and the sound right before the lam of Allah is that kasrah, so the lam is pronounced light.
Why is the lam in Allah sometimes heavy and sometimes light?
It depends on the vowel pronounced right before the name. After a fathah or a dammah, the lam is heavy; after a kasrah, it is light. This is the established rule in Hafs ‘an ‘Asim.
Does the rule apply to Allahumma?
Yes. Allahumma follows exactly the same rule as the name Allah, so it is heavy after a fathah or dammah and light after a kasrah, as in qulillahumma.
Is the lam heavy when I start reading with the name Allah?
Yes. When you begin with the name, the connecting hamzah at its start is pronounced with a fathah, so the lam is heavy.
How can I make sure I pronounce it correctly?
Learn the rule, practice the connected cases, and have your recitation checked by a qualified teacher. Live correction in our Tajweed classes online is the fastest way to make the right sound automatic.
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