Matthew 6:15

But if you do not forgive others [nurturing your hurt and anger with the result that it interferes with your relationship with God], then your Father will not forgive your trespasses.

Matthew 18:35

My heavenly Father will also do the same to [every one of] you, if each of you does not forgive his brother from your heart.”

Treasury of Scripture Knowledge

Summary

Matthew 6:15

But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.

General references

Deuteronomy 15:15

Bible References

General references

And you shall remember and thoughtfully consider that you were [once] a slave in the land of Egypt, and the Lord your God redeemed you; therefore, I am commanding you these things today.