Al-Baqarah 2:170

Wa-itha qeela lahumu ittabiAAoo maanzala Allahu qaloo bal nattabiAAu ma alfaynaAAalayhi abaana awa law kana abaohumla yaAAqiloona shay-an wala yahtadoon

And when it is said to them, "Follow what Allāh has revealed," they say, "Rather, we will follow that which we found our fathers doing." Even though their fathers understood nothing, nor were they guided?

When it is said to them: “Follow what Allah has sent down,” they say: “Instead, we would follow that (religion) on which we have found our fathers.” Is it so, even though their fathers had no understanding at all, nor had they been on the right path?