The ten days of awe – a period of time between Rosh-Hashanah & Yom Kippur (The day of Atonement):

Matthew 6:12-15
And forgive us our debts, as we also have forgiven our debtors. And lead us not into temptation, but deliver us from the evil one.

For if you forgive other people when they sin against you, your heavenly Father will also forgive you.

But if you do not forgive others their sins, your Father will not forgive your sins.

Matthew 26:28

This is my blood of the covenant, which is poured out for many for the forgiveness of sins.

Luke 6:37

Do not judge, and you will not be judged. Do not condemn, and you will not be condemned. Forgive, and you will be forgiven.

1 John 1:9
If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness.

Luke 17:3
So watch yourselves. “If your brother or sister sins against you, rebuke them; and if they repent, forgive them.”