Al-Kahf - 93

﴿حَتَّىٰ إِذَا بَلَغَ بَيْنَ السَّدَّيْنِ وَجَدَ مِنْ دُونِهِمَا قَوْمًا لَا يَكَادُونَ يَفْقَهُونَ قَوْلًا﴾

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(93) Until, when he reached [a pass] between two mountains, he found beside them a people who could hardly understand [his] speech.