Sura al-Isrāʾ 17:82

وَنُنَزِّلُ مِنَ ٱلْقُرْءَانِ مَا هُوَ شِفَآءٌ وَرَحْمَةٌ لِّلْمُؤْمِنِينَ وَلَا يَزِيدُ ٱلظَّٰلِمِينَ إِلَّا خَسَارًا

wa-nunazzilu mina l-qurʾāni mā huwa shifāʾun wa-raḥmatun lil-muʾminīna wa-lā yazīdu l-ẓālimīna illā khasāran

We send down (stage by stage) in the Qur'an that which is a healing and a mercy to those who believe: to the unjust it causes nothing but loss after loss.