Romans 5:20-21

Now Law was brought in later on, so that transgression might increase. But where sin increased, grace has overflowed;

Ephesians 1:7-8

It is in Him, and through the shedding of His blood, that we have our deliverance--the forgiveness of our offences--so abundant was God's grace,

James 5:11

Remember that we call those blessed who endured what they did. You have also heard of Job's patient endurance, and have seen the issue of the Lord's dealings with him--how full of tenderness and pity the Lord is.

Treasury of Scripture Knowledge

Summary

The LORD is merciful and gracious, slow to anger, and plenteous in mercy.

Bible References

Merciful

Romans 5:20
Now Law was brought in later on, so that transgression might increase. But where sin increased, grace has overflowed;
Ephesians 1:7
It is in Him, and through the shedding of His blood, that we have our deliverance--the forgiveness of our offences--so abundant was God's grace,