Al-Kahf 18:93

حَتَّىٰٓ إِذَا بَلَغَ بَيۡنَ ٱلسَّدَّيۡنِ وَجَدَ مِن دُونِهِمَا قَوۡمࣰ ا لَّا يَكَادُونَ يَفۡقَهُونَ قَوۡلࣰ ا۝٩٣

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