When rāʾ is sākin and the immediately preceding vowel is fatḥah, the rāʾ is heavy. The book gives يَرْزُقُونَ: fatḥah on yāʾ precedes the rāʾ with sukūn.
Do not add an extra vowel to rāʾ while trying to make it emphatic. It remains a sākin consonant, pronounced fully but without inserting a new syllable.
An unvoweled rāʾ preceded by ḍammah is also heavy. For example, قُرْآنٌ: the ḍammah on qāf comes before rāʾ sākin.
Compare it with يَرْزُقُونَ: the preceding vowels differ, but the rāʾ is heavy in both. In practice identify the preceding vowel before trying to label the rāʾ.
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Sākin rāʾ after fatḥah or ḍammah
Tafkhīm and Tarqīq — Alif, Divine-Name Lām and Rāʾ
When rāʾ is sākin and the immediately preceding vowel is fatḥah, the rāʾ is heavy. The book gives يَرْزُقُونَ: fatḥah on yāʾ precedes the rāʾ with sukūn.
Do not add an extra vowel to rāʾ while trying to make it emphatic. It remains a sākin consonant, pronounced fully but without inserting a new syllable.
An unvoweled rāʾ preceded by ḍammah is also heavy. For example, قُرْآنٌ: the ḍammah on qāf comes before rāʾ sākin.
Compare it with يَرْزُقُونَ: the preceding vowels differ, but the rāʾ is heavy in both. In practice identify the preceding vowel before trying to label the rāʾ.