In إِنَّهُ كَانَ, the doubled nūn requires approximately two counts of ghunnah.
The pronominal hāʾ in «إِنَّهُ» lies between two moving letters (nūn and kāf). With no following hamzah it receives ṣilah ṣughrā, a two-count link in continuation.
At a stop on «إِنَّهُ», the link is not performed. Ghunnah and ṣilah have different letters and causes.
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Innahū kāna: ghunnah and ṣilah ṣughrā
Al-Kāfirūn and An-Naṣr: Applied Madd, Idghām, Ghunnah and Waqf
In إِنَّهُ كَانَ, the doubled nūn requires approximately two counts of ghunnah.
The pronominal hāʾ in «إِنَّهُ» lies between two moving letters (nūn and kāf). With no following hamzah it receives ṣilah ṣughrā, a two-count link in continuation.
At a stop on «إِنَّهُ», the link is not performed. Ghunnah and ṣilah have different letters and causes.