Al-Kahf 18:14

Warabatna AAalaquloobihim ith qamoo faqaloo rabbunarabbu assamawati wal-ardilan nadAAuwa min doonihi ilahan laqad qulna ithanshatata

And We bound [i.e., made firm] their hearts when they stood up and said, "Our Lord is the Lord of the heavens and the earth. Never will we invoke besides Him any deity. We would have certainly spoken, then, an excessive transgression.

We made their hearts firm when they stood up and said, “Our Lord is the Lord of the heavens and the earth. We shall never invoke any god other than Him, otherwise we would be saying something far from the truth.