وَما مَنَعَنا أَن نُرسِلَ بِالآياتِ إِلّا أَن كَذَّبَ بِهَا الأَوَّلونَ ۚ وَآتَينا ثَمودَ النّاقَةَ مُبصِرَةً فَظَلَموا بِها ۚ وَما نُرسِلُ بِالآياتِ إِلّا تَخويفًا

Nothing prevents Us from sending miracles, except that the previous generations rejected them. We gave Thamud the she-camel as a clear sign, but they maltreated her. We send signs only to instill fear.