مَرَرْتُ بِالْأَفْضَلِ. / مَرَرْتُ بِأَفْضَلِ الْقَوْمِ.
Diptote adjectives can take genitive kasrah when made definite by al or used as the first term of iḍāfah.
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Kasrah Returns with Al or Iḍāfah
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
مَرَرْتُ بِالْأَفْضَلِ. / مَرَرْتُ بِأَفْضَلِ الْقَوْمِ.
Diptote adjectives can take genitive kasrah when made definite by al or used as the first term of iḍāfah.