وَأَقۡسَمُواْ بِٱللَّهِ جَهۡدَ أَيۡمَٰنِهِمۡ لَئِن جَآءَتۡهُمۡ ءَايَةٞ لَّيُؤۡمِنُنَّ بِهَاۚ قُلۡ إِنَّمَا ٱلۡأٓيَٰتُ عِندَ ٱللَّهِۖ وَمَا يُشۡعِرُكُمۡ أَنَّهَآ إِذَا جَآءَتۡ لَا يُؤۡمِنُونَ

Wa aqsamoo billaahi jahda aimaanihim la'in jaaa'at hum Aayatul la yu'minunna bihaa; qul innamal Aayaatu 'indal laahi wa maa yush'irukum annahaaa izaa jaaa'at laa yu'minoon

They swear their strongest oaths by Allah, that if a (special) sign came to them, by it they would believe. Say: "Certainly (all) signs are in the power of Allah: but what will make you (Muslims) realise that (even) if (special) signs came, they will not believe."

— Al-An'am (ٱلْأَنْعَام), 6:109