Quran 18:22

[Some] say, ‘The sleepers were three, and their dog made four,’ others say, ‘They were five, and the dog made six’- guessing in the dark- and some say, ‘They were seven, and their dog made eight.’ Say [Prophet], ‘My Lord knows best how many they were.’ Only a few have real knowledge about them, so do not argue, but stick to what is clear, and do not ask any of these people about them