Ar-Ra'd 13:12

هُوَ ٱلَّذِى يُرِيكُمُ ٱلْبَرْقَ خَوْفًا وَطَمَعًا وَيُنشِئُ ٱلسَّحَابَ ٱلثِّقَالَ

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.