An-Nur 16

وَلَوْلَآ إِذْ سَمِعْتُمُوهُ قُلْتُم مَّا يَكُونُ لَنَآ أَن نَّتَكَلَّمَ بِهَـٰذَا سُبْحَـٰنَكَ هَـٰذَا بُهْتَـٰنٌ عَظِيمٌ

walawlā idh samiʿ'tumūhu qul'tum mā yakūnu lanā an natakallama bihādhā sub'ḥānaka hādhā buh'tānun ʿaẓīmun

And why, when you heard it, did you not say, "It is not for us to speak of this. Exalted are You, [O Allāh]; this is a great slander"?