Yawma yunfakhu fi as-suri fa ta'tuna afwaja
The day when the Trumpet will be blown and you will come in troops
The following is an excerpt of commentary on this ayah, from Tafsir Ibn Kathir:
On that day the Trumpet will be blown and the people will come in crowds and groups. Each group will be behind its prophet, as at another place, Allah said, "The day when We shall call together all human beings with their leaders" (Surah al-Isra ayah 71)
A Quranic Journal: Surah an-Naba ayah 18