11 Bible Verses about Holiness,  Worldly Separation

Then He called the crowd to Him again and said to them, "Listen to me, all of you, and understand [what I am saying]. There is nothing that enters a person's body from the outside that can [spiritually] corrupt him, but it is what proceeds out of a person's life that [spiritually] corrupts him." {{Verse is absent from most ancient manuscripts}}.read more.
And when He had gone into the house away from the crowd His disciples asked Him about this parable. He said to them, "Are you also as lacking in understanding [as the others]? Do you not understand that whatever enters a person's body from the outside cannot [spiritually] corrupt him? It is because it does not go into his heart, but into his stomach, and [eventually] passes out into the toilet." By saying this He made all foods [ceremonially] acceptable.

But Peter answered, "No, Lord, I cannot. I have never eaten any such ordinary or [ceremonially] unfit creatures."

shouting, "[You] Israelites, help [us]! This man is teaching people everywhere [to be] against our people [i.e., the Jews], the law of Moses and this place [i.e., the Temple]; and in addition to that he has also brought Greeks [i.e., Gentiles] into the Temple and has [thereby] contaminated this holy place."

The person who has disregarded the law of Moses is put to death without being shown mercy on the testimony of two or three witnesses. How much more severely do you think a person deserves to be punished who has trampled on the Son of God and has regarded the blood of the [New] Agreement, with which he was set apart for God, an unholy thing and has insulted the Holy Spirit, through whom God's unearned favor is shown?

Now a certain married couple named Ananias and Sapphira sold a piece of property and brought [only] a part of the selling price and gave it to the apostles; but the man and his wife had kept this a secret. But Peter said to Ananias, "Why has Satan filled your heart [causing you] to deceive the Holy Spirit by keeping back part of the selling price of the land [while representing it as the full price]?read more.
While you owned it, was it not yours? Then after you sold it, did you not [still] have control over [what you did with] the money? Why did you decide in your heart to do such a thing? You [really] have not lied to men, but to God [about this matter]." When Ananias heard these words he fell dead [instantly] and his spirit left his body, [causing] everyone who heard [about it] to be gripped with fear. Then young men wrapped up his body and took him out and buried him. About three hours later Sapphira came in, not knowing what had happened [to her husband]. And Peter said to her, "Tell me, did you sell the land for such and such a price?" She answered, "Yes, we did." Then Peter said to her, "Why did you agree together [with your husband] to put the Holy Spirit of the Lord to the test? Look, the ones who buried your husband are at the door, and they will carry you out [to bury you, too]." And instantly she fell dead right in front of him, and her spirit left her body. [Just then the] young men came in and found her dead. They carried her out and buried her with her husband.

If you belonged to the world, the world would love [you as] its own people. But since you do not belong to the world, for I chose you out of it, that is why the world hates you.

You people who have become unfaithful to God, do you not know that being [intimate] friends with the world [of sin] means hostility toward God? Therefore, whoever determines to be an [intimate] friend of the world becomes an enemy of God.

But you people are especially chosen [by God]; you are a royal body of priests; you are a nation especially set apart for God's use; you are a people who belong exclusively to God, that you may express the virtues of the One who called you out of darkness [i.e., of sin and error], and into His marvelous light [i.e., righteousness and truth]. At one time you [Gentiles] were not a [chosen] people, but now you are God's [special] people. Once you had not received [His] mercy, but now you have received it. My dearly loved ones, I urge you, as a people who are foreigners and strangers [in this world], do not give in to sinful desires, which wage war against the soul.

I have given them your word, and the world hated them because they do not belong to the world just as I do not belong to the world. I am not praying that you should take them out of the world, but that you should protect them from the evil one [i.e., the devil]. They do not belong to the world, just as I do not belong to the world.

However, the solid foundation of God stands firm. [Note: This probably refers to the church. See I Tim. 3:15]. It is sealed with these words [i.e., certifying God's ownership and a commitment to Him]: "The Lord knows those who are His people," [See Num. 16:5], and "Everyone who confesses the name of the Lord should stop practicing wickedness." [See Isa. 36:13].

Religion that is pure and uncorrupted in the eyes of [our] God and Father involves taking care of orphans and widows in their distress and keeping oneself unstained by the world.