الْحَسَنُ وَجْهَهُ — حَسَنٌ وَجْهَهُ
The two merely acceptable patterns use accusative wajhahu with a possessive suffix, after either definite or indefinite ḥasan.
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Both Acceptable Patterns
Ṣifah Mushabbahah: Stable Qualities, Government and 18 Patterns
الْحَسَنُ وَجْهَهُ — حَسَنٌ وَجْهَهُ
The two merely acceptable patterns use accusative wajhahu with a possessive suffix, after either definite or indefinite ḥasan.