Surah 6:109
"They have sworn by God the most solemn of their oaths: if indeed a sign comes to them, they will indeed believe in it. Say: ‘The signs (are) only with God.’ What will make you realize that, when it does come, they will not believe?"
6.109 – The signs (are) only with God
The listeners ask for a sign so that they may believe. The answer is that they would not believe even if a convincing sign came to them (v. 111). On verses that question whether the Quran’s messenger performs miracles, see the comments at 43.40.
- from The Quran with Christian Commentary: A Guide to Understanding the Scripture of Islam