Al-Kahf 18:99

Watarakna baAAdahum yawma-ithinyamooju fee baAAdin wanufikha fee assoorifajamaAAnahum jamAAa

And We will leave them that day surging over each other, and [then] the Horn will be blown, and We will assemble them in [one] assembly.

And on that day, (i.e. the Doomsday) We will leave them (all the people including Ya’jūj and Ma’jūj) surging over one another. And the Horn shall be blown, then We shall gather them together.