11 verses have
believe
in Edition Clear Qur'an by Talal Itani / Al-Kahf (The Cave)

18:2Valuable—to warn of severe punishment from Himself; and to deliver good news to the believers who do righteous deeds, that they will have an excellent reward.

18:6Perhaps you may destroy yourself with grief, chasing after them, if they do not believe in this information.

18:13We relate to you their story in truth. They were youths who believed in their Lord, and We increased them in guidance.

18:29And say, “The truth is from your Lord. Whoever wills—let him believe. And whoever wills—let him disbelieve”. We have prepared for the unjust a Fire, whose curtains will hem them in. And when they cry for relief, they will be relieved with water like molten brass, which scalds the faces. What a miserable drink, and what a terrible place.

18:30As for those who believe and lead a righteous life—We will not waste the reward of those who work righteousness.

18:56We send the messengers only as deliverers of good news and warners. Those who disbelieve argue with false argument, in order to defeat the truth thereby. They take My Verses, and the warnings, for a joke.

18:80As for the boy, his parents were believers, and we feared he would overwhelm them with oppression and disbelief.

18:88“But as for him who believes and acts righteously, he will have the finest reward, and We will speak to him of Our command with ease.”

18:100On that Day, We will present the disbelievers to Hell, all displayed.

18:102Do those who disbelieve think that they can take My servants for masters instead of Me? We have prepared Hell for the hospitality of the faithless.

18:107As for those who believe and do righteous deeds, they will have the Gardens of Paradise for hospitality.