(Qaaf) 50 : 20
وَنُفِخَ فِي الصُّورِ ۚ ذَٰلِكَ يَوْمُ الْوَعِيدِ
And the Trumpet will be blown; that is the Day of Promises.
The blow in the Trumpet (Swoor) will happen only after ten crucial signs of Doomsday have appeared, as explained in verse 6: 158. See explanation 36: 51-54; and 39: 68-69.