17. Isra · verses 59–60

وَمَا مَنَعَنَآ أَن نُّرۡسِلَ بِٱلۡأٓيَٰتِ إِلَّآ أَن كَذَّبَ بِهَا ٱلۡأَوَّلُونَۚ وَءَاتَيۡنَا ثَمُودَ ٱلنَّاقَةَ مُبۡصِرَةٗ فَظَلَمُواْ بِهَاۚ وَمَا نُرۡسِلُ بِٱلۡأٓيَٰتِ إِلَّا تَخۡوِيفٗا

Wama manaAAana an nursila bialayati illa an kaththaba biha alawwaloona waatayna thamooda alnnaqata mubsiratan fathalamoo biha wama nursilu bialayati illa takhweefan

And We refrain from sending the signs, only because the men of former generations treated them as false: We sent the she-camel to the Thamud to open their eyes, but they treated her wrongfully: We only send the Signs by way of terror (and warning from evil).

وَإِذۡ قُلۡنَا لَكَ إِنَّ رَبَّكَ أَحَاطَ بِٱلنَّاسِۚ وَمَا جَعَلۡنَا ٱلرُّءۡيَا ٱلَّتِيٓ أَرَيۡنَٰكَ إِلَّا فِتۡنَةٗ لِّلنَّاسِ وَٱلشَّجَرَةَ ٱلۡمَلۡعُونَةَ فِي ٱلۡقُرۡءَانِۚ وَنُخَوِّفُهُمۡ فَمَا يَزِيدُهُمۡ إِلَّا طُغۡيَٰنٗا كَبِيرٗا

Waith qulna laka inna rabbaka ahata bialnnasi wama jaAAalna alrruya allatee araynaka illa fitnatan lilnnasi waalshshajarata almalAAoonata fee alqurani wanukhawwifuhum fama yazeeduhum illa tughyanan kabeeran

Behold! We told thee that thy Lord doth encompass mankind round about: We granted the vision which We showed thee, but as a trial for men,- as also the Cursed Tree (mentioned) in the Qur´an: We put terror (and warning) into them, but it only increases their inordinate transgression!