Al-Kahf 18:22

Some will say, “They were three, their dog was the fourth,” while others will say, “They were five, their dog was the sixth,” – merely guessing at the unseen. And others will say, “They were seven, their dog was the eighth.” Say, “My Lord knows best their number; no one knows about them except a few[14]. So do not argue about them except in a brief manner, nor ask anyone about them.”

[14] i.e., that which is the sure argument, one in the Qur’an.

They [i.e., people] will say there were three, the fourth of them being their dog; and they will say there were five, the sixth of them being their dog - guessing at the unseen; and they will say there were seven, and the eighth of them was their dog. Say, [O Muḥammad], "My Lord is most knowing of their number. None knows them except a few. So do not argue about them except with an obvious argument[785] and do not inquire about them among [the speculators] from anyone."

[785] i.e., one from the Qur’ān, which is the only sure argument.

22. (Some) say they were three, the dog being the fourth among them; and (others) say they were five, the dog being the sixth, - guessing at the unseen; (yet others) say they were seven, and the dog being the eighth. Say (O Muhammad صلى الله عليه وسلم): "My Lord knows best their number; none knows them but a few." So debate not (about their number) except with the clear proof (which We have revealed to you). And consult not any of them (people of the Scripture - Jews and Christians) about (the affair of) the people of the Cave.

(Some) will say: They were three, their dog the fourth, and (some) say: Five, their dog the sixth, guessing at random; and (some) say: Seven, and their dog the eighth. Say (O Muhammad): My Lord is Best Aware of their number. None knoweth them save a few. So contend not concerning them except with an outward contending, and ask not any of them to pronounce concerning them.