What Is Lam Shamsiyyah and Lām Qamariyyah

Lām shamsiyyah and Qamariyyah describe what happens to the lām (ل) of the Arabic definite article ال when it's attached to the front of a noun — not a property of whatever letter comes after it. When the following letter is one of fourteen "sun letters," the lām disappears into it and its sound doubles; when it's one of the other fourteen "moon letters," the lām is pronounced clearly on its own.

Lām Shamsiyyah and Qamariyyah: What Do These Terms Actually Mean?

Every noun made definite in Arabic takes the prefix ال, attached directly to the word with no space. What happens next to the lām in that prefix depends entirely on the first letter of the word it's joined to — that's the whole rule, and it's a real Tajweed rule, not a spelling quirk.

This pair is often introduced to English-speaking students as sun letters and moon letters, a translation that gets the spirit right but the mechanics slightly wrong, which is exactly what the next section corrects.

Why the Common ESL-Blog Explanation Gets This Backwards

Most beginner blogs write that "ت, ث, د, ذ… are sun letters" and "ب, ج, ح… are moon letters," as if the property belonged to the consonant itself. Classical Tajweed manuals name it differently. Ibn al-Jazarī's al-Muqaddimah al-Jazariyyah and al-Jamzūrī's Tuḥfat al-Aṭfāl both call the rule al-lām al-shamsiyyah wa al-lām al-qamariyyah — the solar lām and the lunar lām. The label describes the lām's own behavior, not an identity the following letter carries around on its own.

This process, al- assimilation, means the lām is absorbed into the next letter and that letter is pronounced with a shaddah (doubling) instead. Say "a consonant is a sun letter" and you've made a category error — the same consonant, standing alone with no ال in front of it, has no shamsiyyah or qamariyyah property at all.

The 14 Letters That Make the Lām Shamsiyyah

When ال is followed by one of these fourteen letters, the lām is silent and the following letter is doubled:

• ت ث د ذ ر ز س ش ص ض ط ظ ل ن

These are all letters articulated near the front of the mouth, close to where the lām itself is produced — which is exactly why the lām assimilates into them rather than the letter behind the teeth further back. Try reading الرَّحْمَٰنِ (ar-Raḥmān) out loud this week and notice the lām has vanished entirely.

The 14 Letters That Make the Lām Qamariyyah

These Tajweed lām rules classify the remaining fourteen letters of the alphabet as qamariyyah, where the lām stays fully pronounced:

• ء ب ج ح خ ع غ ف ق ك م ه و ي

Generations of students have memorized this exact set through the classical phrase "ابغِ حَجَّكَ وخَفْ عَقِيمَه" from Tuḥfat al-Aṭfāl — every consonant in that sentence is a moon letter, in order. Read it aloud once and you'll notice you're pronouncing a clear lām before every single word.

How to Hear the Difference: Ash-Shams and Al-Qamar in One Ayah

Surah ash-Shams opens with both cases back to back: "By the sun and its brightness, and by the moon when it follows it" (91:1–2). The Arabic gives you the whole lesson in two words: الشَّمْسِ ("the sun") has ش, a sun letter, so you say ash-shams with a doubled shīn and no lām sound at all. الْقَمَرِ ("the moon") has ق, a moon letter, so the lām stays fully audible: al-qamar.

The Prophet ﷺ said, "Whoever recites a letter from the Book of Allah will have a reward, and that reward is multiplied by ten" (Sunan al-Tirmidhi, 2910). A hadith that ties reward to the letter, not just the word, is exactly why a silent lām in the wrong place — or a doubled letter left un-doubled — isn't a small detail to skip past.

A Simple Drill to Practice This Week

From Waraqa teaching experience, three short passes fix this rule faster than any amount of reading about it:

1. Read through the fourteen sun letters and fourteen moon letters out loud once a day for a week, attaching ال to each one (اَلتَّمْرُ, اَلْبَيْتُ) and listening for whether the lām survives.

2. Recite Surah ash-Shams, verses 1–2, slowly, pausing after الشَّمْسِ and الْقَمَرِ to check the lām disappeared in the first and stayed in the second.

3. Ask your teacher to flag every lām mistake in your next five minutes of recitation — this rule is one an attentive ear catches instantly, even when a student can't hear it in themselves yet.

Where This Fits Into the Rest of Your Tajweed

This is one rule among many that separates careful recitation from guesswork, and it's a natural next step after the basic word-sorting skills in our Arabic grammar for beginners guide. If you're finding several small Tajweed habits are holding your recitation back at once, our guide to fixing common Tajweed mistakes fast covers the other errors we see most often in lessons.

Waraqa's Tajweed courses are taught one-to-one by teachers trained in the Al-Azhar tradition, so a rule like this gets corrected live, ayah by ayah, instead of left for you to self-diagnose. Our adult learning path and FAQ cover how a typical first lesson is structured.

What is the difference between lām shamsiyyah and lām qamariyyah?

Lām shamsiyyah is what happens when the lām of ال is silent and assimilated into the following letter, which is then doubled. Lām qamariyyah is when that same lām is pronounced clearly on its own. The property belongs to the lām's behavior, not to the following letter's identity.

How many sun letters and moon letters are there in Arabic?

There are fourteen letters in each group, covering all twenty-eight consonants of the Arabic alphabet between them. The sun letters are ت ث د ذ ر ز س ش ص ض ط ظ ل ن, and the moon letters are the remaining fourteen.

Why are they called sun and moon letters?

The Arabic word for "sun," الشَّمْسِ, itself begins with a sun letter (ش) and demonstrates the assimilated lām, while "the moon," الْقَمَرِ, begins with a moon letter (ق) and keeps the lām clear — the two words became the traditional teaching example, and the sun/moon names followed from them.

Is this a rule about the letter after ال, or about the lām itself?

It's a rule about the lām. Classical Tajweed sources such as al-Jazariyyah and Tuhfat al-Atfal name it "the solar lām" and "the lunar lām" specifically because the lām is what changes sound — the following consonant has no shamsiyyah or qamariyyah property when it isn't preceded by ال at all.

If small Tajweed rules like this one keep slipping past you in recitation, book a free evaluation and a Waraqa teacher will listen to where your lām rules actually stand before building your next lesson plan.