The wāw at the end of «فَلْيَعْبُدُوا» follows ḍammah and is a madd letter. The next word «رَبَّ» starts with rāʾ, not hamzah; therefore this remains natural madd, not madd munfaṣil.
«رَبَّ» contains a doubled bāʾ. Its shaddah must be articulated fully, without treating it as the nasalized shaddah of nūn or mīm. The alif in «هَٰذَا» is also a long vowel, to be measured normally rather than exaggerated.
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Falyaʿbudū rabb(a): long wāw and doubled bāʾ
Al-Fīl and Quraysh: Applied Iẓhār, Ikhfāʾ, Idghām, Madd and Waqf
The wāw at the end of «فَلْيَعْبُدُوا» follows ḍammah and is a madd letter. The next word «رَبَّ» starts with rāʾ, not hamzah; therefore this remains natural madd, not madd munfaṣil.
«رَبَّ» contains a doubled bāʾ. Its shaddah must be articulated fully, without treating it as the nasalized shaddah of nūn or mīm. The alif in «هَٰذَا» is also a long vowel, to be measured normally rather than exaggerated.