'Strange' in the Bible

Nadab and Abihu died {before Yahweh} when they presented a strange fire {before Yahweh} in the desert of Sinai, and {they had no children}. Eleazar and Ithamar served as priest during the presence of Aaron their father.

[it was] a memorial for the {Israelites}, so that {no strange man} who is not from {the offspring} of Aaron should approach the presence [of] Yahweh to burn a smoke offering; he will not be like Korah and his company, just as Yahweh had spoken to him by the hand of Moses.

But Nadab and Abihu died when they presented strange fire {before} Yahweh.