Why the irregularity? Why this phrase?
As the other manner also exists makes this explanation unattractive, let's explore a clear example:
Most readers read ṯamūdan, whereas Ḥafṣ, Ḥamzah and Yaʕqūb ignore the rasm and read ṯamūda.
So, Šuʿbah's exception cannot really be attributed to prophetic example.
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