Surah Al-An'aam, Verse 8
Translation — Sahih International
And they say, "Why was there not sent down to him an angel?" But if We had sent down an angel, the matter would have been decided; then they would not be reprieved.
Source
Kur'an-ı Kerim, En'âm Suresi 6:8
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/6-suresi-8-ayet