In the name of Allah, the Most Gracious, the Most Merciful.

And Mujahid said: 'ghāsik' is when the night falls, and ʿidhā waqab' is the time of setting of the sun. It is said it is more apparent than 'faraq' (dawn) and the 'falaq' of the morning. And when it says 'waqab’, it means when it enters and everything becomes darker.

بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ

وَقَالَ مُجَاهِدٌ: {غَاسِقٍ} اللَّيْلُ.{إِذَا وَقَبَ} غُرُوبُ الشَّمْسِ يُقَالُ أَبْيَنُ مِنْ فَرَقِ وَفَلَقِ الصُّبْحِ.{وَقَبَ} إِذَا دَخَلَ فِي كُلِّ شَيْءٍ وَأَظْلَمَ.