An-Nur - 24:16

وَلَوْلَا إِذْ سَمِعْتُمُوهُ قُلْتُم مَّا يَكُونُ لَنَا أَن نَّتَكَلَّمَ بِهَذَا سُبْحَانَكَ هَذَا بُهْتَانٌ عَظِيمٌ
[24:16]
And why did you not, when you heard it, say: It does not beseem us that we should talk of it; glory be to Thee! this is a great calumny?
And why did ye not, when ye heard it, say? - "It is not right of us to speak of this: Glory to Allah! this is a most serious slander!"
Wherefor, when ye heard it, said ye not: It is not for us to speak of this. Glory be to Thee (O Allah)! This is awful calumny.