Al-'Ankabut 29:49

Bal huwa ayatun bayyinatunfee sudoori allatheena ootoo alAAilma wamayajhadu bi-ayatina illa aththalimoon

Rather, it [i.e., the Qur’ān] is distinct verses [preserved] within the breasts of those who have been given knowledge. And none reject Our verses except the wrongdoers.

But it (the Qur’ān in itself) is (a package of) evident signs in the hearts of those who are given knowledge. And no one rejects our verses except the wrongdoers.