Romans 3:21-25 (NIV)
Righteousness Through Faith
21But now apart from the law the righteousness of God has been made known, to which the Law and the Prophets testify. 22 This righteousness is given through faith in[a] Jesus Christ to all who believe. There is no difference between Jew and Gentile, 23 for all have sinned and fall short of the glory of God, 24 and all are justified freely by his grace through the redemption that came by Christ Jesus. 25 God presented Christ as a sacrifice of atonement,[b] through the shedding of his blood—to be received by faith. He did this to demonstrate his righteousness, because in his forbearance he had left the sins committed beforehand unpunished
Matthew 18:21-35 (NIV)
The Parable of the Unmerciful Servant
21Then Peter came to Jesus and asked, “Lord, how many times shall I forgive my brother or sister who sins against me? Up to seven times?”
22 Jesus answered, “I tell you, not seven times, but seventy-seven times.
23 “Therefore, the kingdom of heaven is like a king who wanted to settle accounts with his servants. 24 As he began the settlement, a man who owed him ten thousand bags of gold was brought to him. 25 Since he was not able to pay, the master ordered that he and his wife and his children and all that he had be sold to repay the debt.
26 “At this the servant fell on his knees before him. ‘Be patient with me,’ he begged, ‘and I will pay back everything.’ 27 The servant’s master took pity on him, canceled the debt and let him go.
28 “But when that servant went out, he found one of his fellow servants who owed him a hundred silver coins. He grabbed him and began to choke him. ‘Pay back what you owe me!’ he demanded.
29 “His fellow servant fell to his knees and begged him, ‘Be patient with me, and I will pay it back.’
30 “But he refused. Instead, he went off and had the man thrown into prison until he could pay the debt. 31 When the other servants saw what had happened, they were outraged and went and told their master everything that had happened.
32 “Then the master called the servant in. ‘You wicked servant,’ he said, ‘I canceled all that debt of yours because you begged me to. 33 Shouldn’t you have had mercy on your fellow servant just as I had on you?’ 34 In anger his master handed him over to the jailers to be tortured, until he should pay back all he owed.
35 “This is how my heavenly Father will treat each of you unless you forgive your brother or sister from your heart.”