The expressions layakūnan mina ṣ-ṣāghirīn in Yūsuf and lanasfaʿan bi-n-nāṣiyah in al-ʿAlaq have a special written tanwin and pausal treatment.
At a stop, the prescribed alif-based ending differs from the connected tanwin reading.
Do not treat the final written form as a permanent nūn that must be sounded in every context.
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Essential Miscellaneous Rules: Qur’anic Orthography, Pauses and Special Words
The expressions layakūnan mina ṣ-ṣāghirīn in Yūsuf and lanasfaʿan bi-n-nāṣiyah in al-ʿAlaq have a special written tanwin and pausal treatment.
At a stop, the prescribed alif-based ending differs from the connected tanwin reading.
Do not treat the final written form as a permanent nūn that must be sounded in every context.