وَمَحْدُودٌ، وَهُوَ مَا لَا يَكُونُ مَنْصُوبًا بِتَقْدِيرِ «فِي»، بَلْ لَا بُدَّ مِنْ ذِكْرِ «فِي» فِيهِ.
Translation: A delimited place is not treated here as an accusative adverbial with merely implied fī; the preposition fī must be expressed.
A house, market and mosque denote delimited places. To locate sitting within them, the construction uses explicit fī.
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Al-Mafʿūl Fīhi: Adverbials of Time and Place
وَمَحْدُودٌ، وَهُوَ مَا لَا يَكُونُ مَنْصُوبًا بِتَقْدِيرِ «فِي»، بَلْ لَا بُدَّ مِنْ ذِكْرِ «فِي» فِيهِ.
Translation: A delimited place is not treated here as an accusative adverbial with merely implied fī; the preposition fī must be expressed.
A house, market and mosque denote delimited places. To locate sitting within them, the construction uses explicit fī.