Holy Qur’an 18:23

Some say, ‘They were three, the fourth was their dog,’ and others say, ‘They were five, the sixth was their dog,’ guessing at random. And yet others say, ‘They were seven, the eighth was their dog.’ Say, ‘My Lord knows best their number. None knows them except a few.’ So argue not concerning them except with arguing that is overpowering, nor seek information about them from any one of them.

Translation: Maulawi Sher Ali (Ahmadiyya Muslim Jamaat)

Surah 18: Al-Kahf