Chapter 18, Verse 83, The cave
سورة الكهف
وَيَسۡـَٔلُونَكَ عَن ذِي ٱلۡقَرۡنَيۡنِۖ قُلۡ سَأَتۡلُواْ عَلَيۡكُم مِّنۡهُ ذِكۡرًا
And they ask you about dhul-Qarnain. Say: "I shall recite to you something of his story."
Chapter 18, Verse 91, The cave
سورة الكهف
كَذَٰلِكَۖ وَقَدۡ أَحَطۡنَا بِمَا لَدَيۡهِ خُبۡرٗا
So (it was)! And We knew all about him (dhul-Qarnain).
Chapter 21, Verse 85, The Prophets
سورة الأنبياء
وَإِسۡمَٰعِيلَ وَإِدۡرِيسَ وَذَا ٱلۡكِفۡلِۖ كُلّٞ مِّنَ ٱلصَّٰبِرِينَ
waismaaaeela waidreesa watha alkifli kullun mina alssabireena
And (remember) Isma'il (Ishmael), and Idris (Enoch) and dhul-kifl (Isaiah), all were from among As-Sabirin (the patient ones, etc.).
Chapter 38, Verse 48, Sad
سورة ص
وَٱذۡكُرۡ إِسۡمَٰعِيلَ وَٱلۡيَسَعَ وَذَا ٱلۡكِفۡلِۖ وَكُلّٞ مِّنَ ٱلۡأَخۡيَارِ
waothkur ismaaaeela wailyasaaaa watha alkifli wakullun mina alakhyari
And remember Isma'il (Ishmael), Al-Yasa'a (Elisha), and dhul-kifl (Isaiah), all are among the best.
Chapter 89, Verse 2, The Dawn
سورة الفجر
وَلَيَالٍ عَشۡرٖ
By the ten nights (i.e. the first ten days of the month of dhul-Hijjah).