Leviticus 11:47 To make a difference between the unclean and the clean, and between the beast that may be eaten and the beast that may not be eaten.
Leviticus 20:25-
26 Ye shall therefore 
put difference between clean beasts and unclean, and between unclean fowls and clean: and ye shall not make your souls 
abominable by beast, or by fowl, or by any manner of living thing that 
creepeth on the ground, which I have separated from you as unclean. ... And ye shall be holy unto me: for I the LORD [
am] holy, and have 
severed you from [
other] people, that ye should be mine.
Jeremiah 15:19 Therefore thus saith the LORD, If thou 
return, then will I bring thee again, [
and] thou shalt 
stand before me: and if thou 
take forth the precious from the vile, thou shalt be 
as my mouth: 
let them return unto thee; but return not thou unto them.
Ezekiel 22:26 Her 
priests have 
violated my law, and have profaned mine holy things: they have 
put no difference between the holy and profane, neither have they shewed [
difference] between the unclean and the clean, and have 
hid their eyes from my sabbaths, and 
I am profaned among them.
Ezekiel 44:23 And they shall teach my people [
the difference] between the holy and profane, and cause them to discern between the unclean and the clean.
Titus 1:15 Unto 
the pure all things [
are] pure: 
but unto them that are defiled and unbelieving [
is] nothing pure; but even 
their mind and conscience is defiled.
1 Peter 1:14-
16 As 
obedient children, 
not fashioning yourselves according to the former lusts 
in your ignorance: ... Because it is written, Be ye holy; for I am holy.