"[In] houses which Allah has permitted to be raised." Mujahid’s interpretation is: to be built; meaning: the mosques.
﴿فِي بُيُوتٍ أَذِنَ اللَّهُ أَنْ ترفع﴾ تَفْسِيرُ مُجَاهِدٍ: أَنْ تُبْنَى؛ يَعْنِي: الْمَسَاجِدَ.