ʿImrān and saʿdān both end with alif and nūn, but the ruling differs.
ʿImrān: has proper-name status, so it is a diptote.
Saʿdān: in the book’s usage, has no proper-name status, so it is fully declinable.
Establish the word’s meaning and use before deciding its case endings.
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Diptote Causes — Additional Alif and Nūn and Their Conditions
ʿImrān and saʿdān both end with alif and nūn, but the ruling differs.
ʿImrān: has proper-name status, so it is a diptote.
Saʿdān: in the book’s usage, has no proper-name status, so it is fully declinable.
Establish the word’s meaning and use before deciding its case endings.