Leviticus 10:10

10:10 as well as to distinguish between the holy and the common, and between the unclean and the clean,

Isaiah 32:5-6

32:5 A fool will no longer be called honorable;

a deceiver will no longer be called principled.

32:6 For a fool speaks disgraceful things;

his mind plans out sinful deeds.

He commits godless deeds

and says misleading things about the Lord;

he gives the hungry nothing to satisfy their appetite

and gives the thirsty nothing to drink.

Ezekiel 22:26

22:26 Her priests abuse my law and have desecrated my holy things. They do not distinguish between the holy and the profane, or recognize any distinction between the unclean and the clean. They ignore my Sabbaths and I am profaned in their midst.

Ezekiel 44:23

44:23 Moreover, they will teach my people the difference between the holy and the common, and show them how to distinguish between the ceremonially unclean and the clean.

Hebrews 5:14

5:14 But solid food is for the mature, whose perceptions are trained by practice to discern both good and evil.