Al-Kahf 93

حَتَّىٰٓ إِذَا بَلَغَ بَيْنَ ٱلسَّدَّيْنِ وَجَدَ مِن دُونِهِمَا قَوْمًا لَّا يَكَادُونَ يَفْقَهُونَ قَوْلًا

ḥattā idhā balagha bayna l-sadayni wajada min dūnihimā qawman lā yakādūna yafqahūna qawlan

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