Jesus, John, the disciples, and Jonah (Jonas) preached repentance

The Oxford Dictionary defines repentance as feeling and expressing sincere regret or remorse for one's wrong goings or sin.

The Merriam Webster Dictionary defines repentance as an action; turning from sin and dedicating oneself to the amendment of one's life

Dictionary.com defines repentance: to feel sorry, self-reproachful, or contrite for past conduct; regret or be conscience-stricken about a past action, attitude, etc. and such sorrow for sin or fault as to be disposed to change one's life for the better; be penitent.

Webster's Dictionary defines repentance as: In theology, to sorrow or be pained for sin, as a violation of God's holy law, a

dishonor to his character and government, and the foulest ingratitude to a Being of infinite benevolence.

Matthew 3:7-8 King James Version

7 But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come? 8 Bring forth therefore fruits meet for repentance:

Matthew 4:17 KJV From that time Jesus began to preach, and to say, Repent: for the kingdom of heaven is at hand.

Matthew 9:10-13 KJV

10 And it came to pass, as Jesus sat at meat in the house, behold, many publicans and sinners came and sat down with him and his disciples.11 And when the Pharisees saw it, they said unto his disciples, Why eateth your Master with publicans and sinners? 12 But when Jesus heard that, he said unto them, They that be whole need not a physician, but they that are sick. 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.

Luke 13:1-5 KJV

There were present at that season some that told him of the Galilaeans, whose blood Pilate had mingled with their sacrifices. 2 And Jesus answering said unto them, Suppose ye that these Galilaeans were sinners above all the Galilaeans, because they suffered such things? 3 I tell you, Nay: but, except ye repent, ye shall all likewise perish. 4 Or those eighteen, upon whom the tower in Siloam fell, and slew them, think ye that they were sinners above all men that dwelt in Jerusalem? 5 I tell you, Nay: but, except ye repent, ye shall all likewise perish.

Luke 17:3,4 KJV

3 Take heed to yourselves: If thy brother trespass against thee, rebuke him; and if he repent, forgive him. 4 And if he trespass against thee seven times in a day, and seven times in a day turn again to thee, saying, I repent; thou shalt forgive him.

Matthew 3:1-2 KJV

1 In those days came John the Baptist, preaching in the wilderness of Judaea, 2 And saying, Repent ye: for the kingdom of heaven is at hand.

Mark 1:4,15 KJV

John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins. 15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel.

Luke 3:2,3 KJV

2 Annas and Caiaphas being the high priests, the word of God came unto John the son of Zacharias in the wilderness.

3 And he came into all the country about Jordan, preaching the baptism of repentance for the remission of sins;

Mark 6: 12, 13 KJV

12 And they went out, and preached that men should repent. 13 And they cast out many devils, and anointed with oil many that were sick, and healed them.

Acts 2:37-39 KJV 37 Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do? 38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. 39 For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.

Acts 3:19 KJV

19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord.

Acts 11: 14-21 KJV

14 Who shall tell thee words, whereby thou and all thy house shall be saved. 15 And as I began to speak, the Holy Ghost fell on them, as on us at the beginning. 16 Then remembered I the word of the Lord, how that he said, John indeed baptized with water; but ye shall be baptized with the Holy Ghost. 17 Forasmuch then as God gave them the like gift as he did unto us, who believed on the Lord Jesus Christ; what was I, that I could withstand God? 18 When they heard these things, they held their peace, and glorified God, saying, Then hath God also to the Gentiles granted repentance unto life. 19 Now they which were scattered abroad upon the persecution that arose about Stephen travelled as far as Phenice, and Cyprus, and Antioch, preaching the word to none but unto the Jews only. 20 And some of them were men of Cyprus and Cyrene, which, when they were come to Antioch, spake unto the Grecians, preaching the Lord Jesus. 21 And the hand of the Lord was with them: and a great number believed, and turned unto the Lord.

Acts 20:20-23 KJV

20 And how I kept back nothing that was profitable unto you, but have shewed you, and have taught you publicly, and from house to house, 21 Testifying both to the Jews, and also to the Greeks, repentance toward God, and faith toward our Lord Jesus Christ. (See: Romans 2)

Revelation 3: 2-3 KJV

2 Be watchful, and strengthen the things which remain, that are ready to die: for I have not found thy works perfect before God. 3 Remember therefore how thou hast received and heard, and hold fast, and repent. If therefore thou shalt not watch, I will come on thee as a thief, and thou shalt not know what hour I will come upon thee.

Matthew 12:40-41 KJV

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. 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. (see" Jonah 1:1,2 and Jonah 3:1,2, 10)

Acts 17:30 KJV And the times of this ignorance God winked at; but now commandeth all men every where to repent:

2 Peter 3: 9 KJV

The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.

Luke 15:10 KJV Likewise, I say unto you, there is joy in the presence of the angels of God over one sinner that repenteth.