Al-A'raf - 7:28

وَإِذَا فَعَلُواْ فَاحِشَةً قَالُواْ وَجَدْنَا عَلَيْهَا آبَاءنَا وَاللّهُ أَمَرَنَا بِهَا قُلْ إِنَّ اللّهَ لاَ يَأْمُرُ بِالْفَحْشَاء أَتَقُولُونَ عَلَى اللّهِ مَا لاَ تَعْلَمُونَ
[7:28]
And when they commit an indecency they say: We found our fathers doing this, and Allah has enjoined it on us. Say: Surely Allah does not enjoin indecency; do you say against Allah what you do not know?
When they do aught that is shameful, they say: "We found our fathers doing so"; and "Allah commanded us thus": Say: "Nay, Allah never commands what is shameful: do ye say of Allah what ye know not?"
And when they do some lewdness they say: We found our fathers doing it and Allah hath enjoined it on us. Say: Allah, verily, enjoineth not lewdness. Tell ye concerning Allah that which ye know not?