Surah Al-Anbiya · 21:96

“I am informed that one of the signs of it is that I will be coming back (to earth) — and Allah AWJ knows when that is — and Dajjal will come, and I will kill him... until I will make du'a to Allah that they be killed, so Allah AWJ will kill them, and the entire world will be stenched with their decomposed bodies... I have been told that when this happens, the Day of Judgment will be like a pregnant woman who is just about to give birth.”

Same source as the post on this event that carries this ayah.