Though the LORD knoweth them that are his, and can and will hide them in the day of the visitation of the ungodly, yet the precept is, come out from among them and separate yourselves. See 2 Corinthians 6:17-18; Revelation 18:4.
Related Commentaries of Numbers 16:20
Numbers 16:20-21
20 And the LORD spake unto Moses and unto Aaron, saying,
21 Separate yourselves from among this congregation, that I may consume them in a moment.