Mealler

Have we given them a book before this, and they are upholding it?

The fact is that: they said, "We found our parents carrying on certain practices, and we are following in their footsteps."

Invariably, when we sent a warner to any community, the leaders of that community would say, "We found our parents following certain practices, and we will continue in their footsteps."

(The messenger) would say, "What if I brought to you better guidance than what you inherited from your parents?" They would say, "We are disbelievers in the message you brought."

Consequently, we requited them. Note the consequences for the rejectors.