RichardAnna Boyce I only count 10 in the KJV if you count the once actually translated REPENT in English They are ALL related to salvation and eternal life. Not sure what you are reading down yonder

The first mention of repentance in the New Testament is in the preaching of John the Baptist. John is sometimes called “the last of the Old Testament Prophets” and his preaching of repentance is in line with theirs. It is translated by the Greek word metanoia, which must be interpreted in line with Biblical usage. (There is a popular fallacy that you tear Greek words apart and obtain a definition from the bits, but this is as much nonsense as is would be in English with words such as “butterfly”. Words are always defined by their usage and context.)

It turns out that John the Baptist has the same concept of turning from and to. The from is from unrighteous behaviour, and the to is to the “Lamb of God”

An example of the practical and concrete nature of John’s repentance is found in Luke 3:

Bear fruits in keeping with repentance….
And the crowds asked him, “What then shall we do?”
And he answered them, “Whoever has two tunics is to share with him who has none, and whoever has food is to do likewise.”
Tax collectors also came to be baptized and said to him, “Teacher, what shall we do?”
And he said to them, “Collect no more than you are authorized to do.”
Soldiers also asked him, “And we, what shall we do?” And he said to them, “Do not extort money from anyone by threats or by false accusation, and be content with your wages.”
John’s teaching on repentance formed the foundation for the preaching of Jesus, e.g. Matt 4:

From that time Jesus began to preach, saying, “Repent, for the kingdom of heaven is at hand.”
Jesus didn’t redefine “repentance” from John’s meaning (that would have made a nonsense of John’s role in preparing the way)

The Apostolic gospel had a strong emphasis on repentance, and we can see from Acts 26 that Paul used an identical expression to refer to the need for deeds that were the visible expression of repentance.

“Therefore, O King Agrippa, I was not disobedient to the heavenly vision,
but declared first to those in Damascus, then in Jerusalem and throughout all the region of Judea, and also to the Gentiles, that they should repent and turn to God, performing deeds in keeping with their repentance.
In 2 Corinthians 12 Paul talks about sin and repentance. In v.20 they are still sinning and in v.21 they “have not repented”. Paul uses the terms interchangeably. It would make no sense at all if in v.21 he meant that they had mentally resolved not to sin but were still regularly practicing it.

For I fear that perhaps when I come I may find you not as I wish, and that you may find me not as you wish—that perhaps there may be quarreling, jealousy, anger, hostility, slander, gossip, conceit, and disorder.
I fear that when I come again my God may humble me before you, and I may have to mourn over many of those who sinned earlier and have not repented of the impurity, sexual immorality, and sensuality that they have practiced.
Finally, there is no doubt that in Revelation 2:5, repentance implies actually replacing one set of behaviours with another:

Remember therefore from where you have fallen; repent, and do the works you did at first. If not, I will come to you and remove your lamp-stand from its place, unless you repent.