Surah Ar-Ra'd, Verse 12

هُوَ ٱلَّذِي يُرِيكُمُ ٱلۡبَرۡقَ خَوۡفٗا وَطَمَعٗا وَيُنشِئُ ٱلسَّحَابَ ٱلثِّقَالَ١٢

huwa alladhī yurīkumu l-barqa khawfan waṭamaʿan wayunshi-u l-saḥāba l-thiqāla

It is He who shows you lightning, [causing] fear and aspiration, and generates the heavy clouds.