حَتّٰٓى اِذَا بَلَغَ بَيۡنَ السَّدَّيۡنِ وَجَدَ مِنۡ دُوۡنِهِمَا قَوۡمًاۙ لَّا يَكَادُوۡنَ يَفۡقَهُوۡنَ قَوۡلاً
Until he reached (a place) between two mountains. He found a people dwelling behind these mountains. They were unable to understand (anyone’s) speech.