Al-An'aam (6:109)
وَأَقۡسَمُوا۟ بِٱللَّهِ جَهۡدَ أَیۡمَـٰنِهِمۡ لَىِٕن جَاۤءَتۡهُمۡ ءَایَةࣱ لَّیُؤۡمِنُنَّ بِهَاۚ قُلۡ إِنَّمَا ٱلۡـَٔایَـٰتُ عِندَ ٱللَّهِۖ وَمَا یُشۡعِرُكُمۡ أَنَّهَاۤ إِذَا جَاۤءَتۡ لَا یُؤۡمِنُونَ
And they swear a solemn oath by Allah that if there come unto them a portent they will believe therein. Say; Portents are with Allah and (so is) that which telleth you that if such came unto them they would not believe.
— Mohammed Marmaduke William Pickthall
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