Acts 13
38 Therefore let it be known to you, brethren, that through [
p]Him forgiveness of sins is proclaimed to you, 39 and [
q]through Him everyone who believes is [
r]freed [
s]from all things, from which you could not be [
t]freed [
u]through the Law of Moses.
Acts 26
And I said, ‘Who are You, Lord?’ And the Lord said, ‘I am Jesus whom you are persecuting. 16 But get up and stand on your feet; for this purpose I have appeared to you, to appoint you a minister and a witness not only to the things which you have [
k]seen, but also to the things in which I will appear to you; 17 rescuing you from the
Jewish people and from the Gentiles, to whom I am sending you, 18 to open their eyes so that they may turn from darkness to light and from the dominion of Satan to God, that they may receive forgiveness of sins and an inheritance among those who have been sanctified by faith in Me.’
Ephesians 1:
In [
a]Him we have redemption through His blood, the forgiveness of our trespasses, according to the riches of His grace 8 which He [
b]lavished on [
c]us.
Ephesians 4
32 Be kind to one another, tender-hearted, forgiving each other, just as God in Christ also has forgiven [
a]you.
Colossians 1
12 giving thanks to the Father, who has qualified us [
r]to share in the inheritance of the [
s]saints in Light.
13 [
t]For He rescued us from the [
u]domain of darkness, and transferred us to the kingdom of [
v]His beloved Son, 14 in whom we have redemption, the forgiveness of sins.
James 5
and the prayer [
l]offered in faith will [
m]restore the one who is sick, and the Lord will raise him up, and if he has committed sins, [
n]they will be forgiven him.
1 John 1
9 If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness.
1 John 2
12 I am writing to you, little children, because your sins have been forgiven you for His name’s sake.
 
Further:
Acts 10
42 And He ordered us to [
af]preach to the people, and solemnly to testify that this is the One who has been appointed by God as Judge of the living and the dead. 43 Of Him all the prophets bear witness that through His name everyone who believes in Him receives forgiveness of sins."
Note in acts 10 that only He is appointed judge over the living and dead.
Psalm 51 (This is David speaking to God after he had sinned greviously against other people)
Against you, you only, have I sinned
and done what is evil in your sight;
so you are right in your verdict
and justified when you judge.
 
We don't get to be a position of judging people as unforgiven by holding offense against them. He took on all our sin debts to himself, so he has the authority to forgive them all to us, because we are ultimately only indebted to Him.
Acts 2
Peter said to them, " Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit.
Acts 8
18 Now when Simon saw that the Spirit was bestowed through the laying on of the apostles’ hands, he offered them money, 19 saying, "Give this authority to me as well, so that everyone on whom I lay my hands may receive the Holy Spirit." 20 But Peter said to him, "May your silver perish with you, because you thought you could obtain the gift of God with money! 21 You have no part or portion in this [
f]matter, for your heart is not right before God. 22 Therefore repent of this wickedness of yours, and pray the Lord that, if possible, the intention of your heart may be forgiven you. 23 For I see that you are in the gall of bitterness and in the [
g]bondage of iniquity."
 
Notice that it is not having a right heart before God that denies him the gift of God.
The solution for him is to repent, and it is the Lord who can forgive him of that sin.
 
 
 
Luke 17
3 [
c]Be on your guard! If your brother sins, rebuke him; and if he repents, forgive him. 4 And if he sins against you seven times a day, and returns to you seven times, saying, ‘I repent,’ [
d]forgive him."
Here Jesus puts no qualification on forgiving others, he says to always forgive those who repent.
In the same way Jesus always forgives those who repent. He expects the same of us because he has forgiven us completely. We don't have the right anymore to hold sins against someone whom God has already forgiven through their repentance.
 
 
 
Mark 11
25 Whenever you stand praying, forgive, if you have anything against anyone, so that your Father who is in heaven will also forgive you your transgressions. 26 [[
f]But if you do not forgive, neither will your Father who is in heaven forgive your transgressions."]
Matthew 18
33 Should you not also have had mercy on your fellow slave, in the same way that I had mercy on you?’ 34 And his lord, moved with anger, handed him over to the torturers until he should repay all that was owed him. 35 My heavenly Father will also do the same to you, if each of you does not forgive his brother from [
ab]your heart."
 
Forgiving others is for our sake, not theirs.
God is teaching us how to be merciful and loving to the same extent that He is.