Romans 3:24-26

but anybody may have right standing with God as a free gift of His undeserved favor, through the ransom provided in Christ Jesus.

Romans 5:21

so that just as sin had reigned by death, so His favor too might reign in right standing with God which issues in eternal life through Jesus Christ our Lord.

Ephesians 1:7-8

It is through union with Him that we have redemption by His blood and the forgiveness of our shortcomings, in accordance with the generosity of His unmerited favor

Treasury of Scripture Knowledge

Summary

The LORD is longsuffering, and of great mercy, forgiving iniquity and transgression, and by no means clearing the guilty, visiting the iniquity of the fathers upon the children unto the third and fourth generation.

Bible References

Long-suffering

Romans 3:24
but anybody may have right standing with God as a free gift of His undeserved favor, through the ransom provided in Christ Jesus.
Romans 5:21
so that just as sin had reigned by death, so His favor too might reign in right standing with God which issues in eternal life through Jesus Christ our Lord.
Ephesians 1:7
It is through union with Him that we have redemption by His blood and the forgiveness of our shortcomings, in accordance with the generosity of His unmerited favor