A. Jesus commanded us to witness to the whole world:

MAR 16:15. And he said unto them, Go ye into all the world, and preach the gospel to every creature.

MAT 28:19. Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:

LUK 8:39. Return to thine own house, and shew how great things God hath done unto thee. And he went his way, and published throughout the whole city how great things Jesus had done unto him.

MAR 5:19. Howbeit Jesus suffered him not, but saith unto him, Go home to thy friends, and tell them how great things the Lord hath done for thee, and hath had compassion on thee.

MAT 11:5. The blind receive their sight, and the lame walk, the lepers are cleansed, and the deaf hear, the dead are raised up, and the poor have the gospel preached to them.

ISA 61:1. The Spirit of the Lord GOD is upon me; because the LORD hath anointed me to preach good tidings unto the meek; he hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound;

ACT 26:22. Having therefore obtained help of God, I continue unto this day, witnessing both to small and great, saying none other things than those which the prophets and Moses did say should come:

ROM 15:20. Yea, so have I strived to preach the gospel, not where Christ was named, lest I should build upon another man's foundation:

ROM 15:21. But as it is written, To whom he was not spoken of, they shall see: and they that have not heard shall understand.

ACT 22:21. And he said unto me, Depart: for I will send thee far hence unto the Gentiles.

ACT 28:28. Be it known therefore unto you, that the salvation of God is sent unto the Gentiles, and that they will hear it.

ACT 17:18. Then certain philosophers of the Epicureans, and of the Stoicks, encountered him. And some said, What will this babbler say? other some, He seemeth to be a setter forth of strange gods: because he preached unto them Jesus, and the resurrection.

ACT 17:19. And they took him, and brought him unto Areopagus, saying, May we know what this new doctrine, whereof thou speakest, is?

ACT 17:20. For thou bringest certain strange things to our ears: we would know therefore what these things mean.

ACT 17:21. (For all the Athenians and strangers which were there spent their time in nothing else, but either to tell, or to hear some new thing.)

EZE 2:7. And thou shalt speak my words unto them, whether they will hear, or whether they will forbear: for they are most rebellious.

EZE 3:17. Son of man, I have made thee a watchman unto the house of Israel: therefore hear the word at my mouth, and give them warning from me.

EZE 3:18. When I say unto the wicked, Thou shalt surely die; and thou givest him not warning, nor speakest to warn the wicked from his wicked way, to save his life; the same wicked man shall die in his iniquity; but his blood will I require at thine hand.

B. Who not to witness to:

MAT 9:13. But go ye and learn what that meaneth, I will have mercy, and not sacrifice: for I am not come to call the righteous, but sinners to repentance.

PRO 23:9. Speak not in the ears of a fool: for he will despise the wisdom of thy words.

ACT 13:45. But when the Jews saw the multitudes, they were filled with envy, and spake against those things which were spoken by Paul, contradicting and blaspheming.

ACT 13:46. Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.

MAT 7:6. Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.

ACT 18:6. And when they opposed themselves, and blasphemed, he shook his raiment, and said unto them, Your blood be upon your own heads; I am clean; from henceforth I will go unto the Gentiles.

MAT 10:14. And whosoever shall not receive you, nor hear your words, when ye depart out of that house or city, shake off the dust of your feet.

TIT 3:10. A man that is an heretick after the first and second admonition reject;

TIT 3:11. Knowing that he that is such is subverted, and sinneth, being condemned of himself.