الْكُحْلُ مِنْهُ فِي عَيْنِ زَيْدٍ
In this technical comparison, the pronoun of minhu goes back to al-kuḥl. The two conditions of kohl are being compared, not kohl versus the eye itself.
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What Does Minhu Refer to?
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
الْكُحْلُ مِنْهُ فِي عَيْنِ زَيْدٍ
In this technical comparison, the pronoun of minhu goes back to al-kuḥl. The two conditions of kohl are being compared, not kohl versus the eye itself.