An-Nur 24:16

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"?