بسم الله الرحمن الرحيم
The Rules of Laam
Generally, a Laam is always Tarqeeq (Empty-mouth). The only time where it may become heavy is when Lafdh Al-Jalalah – لفظ الجلالة (The name of Allaah) is mentioned.
What is meant by the above is, the Laam on Lafdh Al-Jalalah will be either Tafkheem or Tarqeeq depending on the vowelling of the letter that precedes Lafdh Al Jalalah.
If the letter before Lafdh Al Jalalah has a Kasra, then the Laam on Lafdh Al Jalalah will be pronounced Tarqeeq.
For instance:
أعوذ بالله من الشيطان الرجيم
Here, the Baa before Lafdh Al Jalalah has a kasrah, and thus, the laam on Lafdh Al Jalalah will be pronounced as Tarqeeq.
Other examples of Laam as Tarqeeq:
وَمِنَ النَّاسِ مَن يَقُولُ آمَنَّا بِاللَّـهِ وَبِالْيَوْمِ الْآخِرِ وَمَا هُم بِمُؤْمِنِينَ
(Surah Baqarah Verse 8)
وَادْعُوا شُهَدَاءَكُم مِّن دُونِ اللَّـهِ إِن كُنتُمْ صَادِقِينَ
(Surah Baqarah Verse 24)
When the preceeding letter before Lafdh Al Jalalah has a Fatha or a Dhamma, then the Laam in Lafdh Al Jalalah will be pronounced Tafkheem:
وَتِلْكَ حُدُودُ اللَّـهِ ۚ وَمَن يَتَعَدَّ حُدُودَ اللَّـهِ فَقَدْ ظَلَمَ نَفْسَهُ ۚ لَا تَدْرِي لَعَلَّ اللَّـهَ يُحْدِثُ بَعْدَ ذَٰلِكَ أَمْرًا
(Surah Talaq Verse 1)
Other examples of Laam in Lafdh Al Jalalah being Tafkheem are:
يُخَادِعُونَ اللَّـهَ وَالَّذِينَ آمَنُوا وَمَا يَخْدَعُونَ إِلَّا أَنفُسَهُمْ وَمَا يَشْعُرُونَ
(Surah Baqarah Verse 5)
إِذَا جَاءَ نَصْرُ اللَّـهِ وَالْفَتْحُ
(Surah Nasr Verse 1)
Can you spot the ‘Rules of Laam’ in the following video?: