Where the first sākin is not a madd letter, the source resolves the meeting by giving it a vowel rather than omitting the consonant. Its general rule uses kasrah.
Example: إِنِ ارْتَبْتُمْ. The final nūn receives kasrah during liaison. This breaks the meeting of two sākin letters. The source then gives particular exceptions to the general kasrah pattern.
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When the first sākin is not madd: vowelize
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
Where the first sākin is not a madd letter, the source resolves the meeting by giving it a vowel rather than omitting the consonant. Its general rule uses kasrah.
Example: إِنِ ارْتَبْتُمْ. The final nūn receives kasrah during liaison. This breaks the meeting of two sākin letters. The source then gives particular exceptions to the general kasrah pattern.