Al-Mursalat 77:35

<h2>The driving of the Criminals to their Final Abode in Hell and how it will be done</h2><p>Allah informs about the disbelievers who deny the final abode, the recompense, Paradise, and the Hellfire. On the Day of Judgement it will be said to them:</p><div class="arabic uthmani">انطَلِقُواْ إِلَى مَا كُنتُمْ بِهِ تُكَذِّبُونَ - انطَلِقُواْ إِلَى ظِلٍّ ذِى ثَلَـثِ شُعَبٍ </div><p>(Depart you to that which you used to deny! Depart you to a shadow in three columns,) meaning, a flame of fire when it rises and ascends with smoke. So due to its severity and strength, it will have three columns.</p><div class="arabic uthmani">لاَّ ظَلِيلٍ وَلاَ يُغْنِى مِنَ اللَّهَبِ </div><p>(Neither shady nor of any use against the fierce flame of the Fire.) meaning, shade of the smoke that comes from the flame -- which itself will not have a shade, nor will it benefit against the flame. This means it will not protect them from the heat of the flame. Allah said,</p><div class="arabic uthmani">إِنَّهَا تَرْمِى بِشَرَرٍ كَالْقَصْرِ </div><p>(Verily, it throws sparks as Al-Qasr,) meaning, its sparks will shoot out from its flame like huge castles. Ibn Mas`ud said, "Like forts." Ibn `Abbas, Mujahid, Qatadah and Malik who reported from Zayd bin Aslam and others …

This is a day wherein they speak not,

That will be a Day when they shall not be able to speak.

That will be a Day when they shall not speak (during some part of it),

This is a Day when they will not speak.