We must be set apart for He is set apart.

1And יהוה spoke to Mosheh, saying,

2“Speak to all the congregation of the children of Yisra’ĕl, and say to them, ‘Be set-apart, for I יהוה your Elohim am set-apart.
Lev 19

20Reprove those who are sinning, in the presence of all, so that the rest also might fear.
1 Tim 5
Numbers 16:1-40