Leviticus 10:10

and to make a distinction and recognize a difference between the holy (sacred) and the common (profane), and between the [ceremonially] unclean and the clean;

Leviticus 11:47

to make a distinction between the [ceremonially] unclean and the [ceremonially] clean, and between the animal that may be eaten and the animal that may not be eaten.

Her priests have done violence to My law and have profaned My holy things. They have made no distinction between the holy (sacred) and the profane (secular), they have not taught [people] the difference between the unclean and the clean; and they hide their eyes from My Sabbaths, and I am profaned among them.

Ezekiel 44:23

The priests shall teach My people the difference between the holy and the common, and teach them to distinguish between the (ceremonially) unclean and the clean.

1 Peter 1:14-16

[Live] as obedient children [of God]; do not be conformed to the evil desires which governed you in your ignorance [before you knew the requirements and transforming power of the good news regarding salvation].

Leviticus 20:25-26

You are therefore to make a distinction between the [ceremonially] clean animal and the unclean, and between the unclean bird and the clean; and you shall not make yourselves detestable by animal or by bird or by anything that crawls on the ground, which I have set apart from you as unclean.

Jeremiah 15:19

Therefore, thus says the Lord [to Jeremiah],
“If you repent [and give up this mistaken attitude of despair and self-pity], then I will restore you [to a state of inner peace]
So that you may stand before Me [as My obedient representative];
And if you separate the precious from the worthless [examining yourself and cleansing your heart from unwarranted doubt concerning My faithfulness],
You will become My spokesman.
Let the people turn to you [and learn to value My values]—
But you, you must not turn to them [with regard for their idolatry and wickedness].

Titus 1:15

To the pure, all things are pure; but to the corrupt and unbelieving, nothing is pure; both their mind and their conscience are corrupted.

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