Al-Kahf 18:99

<h2>The Barrier restrains Them, but It will be breached when the Hour draws nigh</h2><p>Allah tells us that Ya'juj and Ma'juj could not climb over the barrier or penetrate its lower portion. Varying forms of the verb are used here in the Arabic text to reflect the difficulty of the action referred to.</p><div class="arabic uthmani">فَمَا اسْطَـعُواْ أَن يَظْهَرُوهُ وَمَا اسْتَطَـعُواْ لَهُ نَقْبًا </div><p>(So they (Ya'juj and Ma'juj) could not scale it or dig through it.) This indicates that they could not penetrate it or dig through it. Imam Ahmad recorded that Zaynab bint Jahsh, the wife of the Prophet said, "The Prophet woke from sleep, and he was red in the face. He said,</p><div class="arabic uthmani">«لَا إِلَهَ إِلَّا اللهُ وَيْلٌ لِلْعَرَبِ مِنْ شَرَ قَدِ اقْتَرَبَ فُتِحَ الْيَوْمَ مِنْ رَدْمِ يَأْجُوجَ وَمَأْجُوجَ مِثْلُ هَذَا»</div><p>(La ilaha illallah! Woe to the Arabs from the evil that has approached (them). Today a hole has been opened in the barrier of Ya'juj and Ma'juj like this.) and he made a circle with his index finger and thumb. I Zaynab said, `O Messenger of Allah, will we be destroyed even though there will be righteous people among us' He said:</p><div class="arabic uthmani">«نَعَمْ إِذَا كَثُرَ الْخَبَث»</div><p>(Yes, if evil …

And on that day we shall let some of them surge against others, and the Trumpet will be blown. Then We shall gather them together in one gathering.

On that day We shall leave them to surge like waves on one another: the trumpet will be blown, and We shall collect them all together.

And on that Day [i.e. the Day Ya'juj and Ma'juj (Gog and Magog) will come out], We shall leave them to surge like waves on one another, and the Trumpet will be blown, and We shall collect them all together.

On that Day, We will leave them surging upon one another. And the Trumpet will be blown, and We will gather them together.