He says in Jeremiah...
Jerm 18:7 At what instant I shall speak concerning a nation, and concerning a kingdom, to pluck up, and to pull down, and to destroy it;
Jerm 18:8 If that nation, against whom I have pronounced, turn from their evil, I will repent of the evil that I thought to do unto them.
For example (after the fleeing the commission of the word of the LORD the first time) the word of the Lord came again to Jonah a second time.
Jonah 3:1 And the word of the LORD came unto Jonah the second time, saying,
Jonah 3:2 Arise, go unto Nineveh, that great city, and preach unto it the preaching that I bid thee.
Jonah 3:4 And Jonah began to enter into the city a day's journey,and he cried, and said,
Yet forty days, and Nineveh shall be overthrown.
Jonah 3:5 So the people of Nineveh believed God, and proclaimed a fast, and put on sackcloth, from the greatest of them even to the least of them.
Jona 3:10 And God saw their works, that they turned from their evil way;
And God repented of the evil, that he had said that he would do unto them; and he did it not.
And again...
Jerm 18:8 If that nation, against whom I have pronounced, turn from their evil,
I will repent of the evil that I thought to do unto them.
As the LORD hath said,
I have no pleasure in the death of the wicked; but that the wicked turn from his way and live:
Similarly with Christ as here
Ezek 33:7 So thou, O son of man, I have set thee a watchman unto the house of Israel; therefore thou shalt hear the word at my mouth, and warn them from me.
Mat 12:38 Then certain of the scribes and of the Pharisees answered, saying, Master, we would see a sign from thee.
Mat 12:39 But he answered and said unto them, An evil and adulterous generation seeketh after a sign; and there shall no sign be given to it, but the sign of the prophet Jonas:
Mat 12:40 For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth.
Mat 12:41 The men of Nineveh shall rise in judgment with this generation, and shall condemn it: because they repented at the preaching of Jonas; and, behold, a greater than Jonas is here.
They repented at the preaching of Jonas, and Jesus also was sent unto them to bless them (first) in this way
Acts 3:26 Unto you first God, having raised up his Son Jesus, sent him to bless you, in turning away every one of you from his iniquities. (See 2 Ti 2:19 also)
Col 1:28 Whom we preach, warning every man, and teaching every man in all wisdom; that we may present every man perfect in Christ Jesus.
But right here again in respects to his blood will He require at the watchmans hand
Ezek 33:6 But if the watchman see the sword come, and blow not the trumpet, and the people be not warned; if the sword come, and take any person from among them, he is taken away in his iniquity; but his blood will I require at the watchman's hand.
As Paul had said, "Woe to me, if I preach not the gospel"
But similarly says this as well.
Acts 20:26 Wherefore I take you to record this day, that I am pure from the blood of all men.
Acts 20:27 For I have not shunned to declare unto you all the counsel of God.
As Paul can be seen preaching concerning the faith in Christ to Felix in Acts 24:25
As he (Paul) reasoned of righteousness, temperance, and judgment to come,
Felix trembled, and answered, Go thy way for this time; when I have a convenient season, I will call for thee.
There might be an example in a nation, as the disciples were sent to the nations also