John 1:17

the law indeed was delivered by Moses, but grace and truth was the dispensation of Jesus Christ.

Romans 5:20-21

the law was introduc'd, that the greatness of the fall might fully appear; but the more sin display'd its enormity, the divine favour was so much the more transcendent.

Romans 15:8-9

for I tell you, that Jesus Christ was a minister to the Jews, to manifest the veracity of God in fulfilling the promises made to the fathers:

Ephesians 1:7

who has by his blood obtained for us the redemption, even the forgiveness of our sins, according to the riches of his grace,

Ephesians 2:4-7

then it was that God, who is rich in mercy, thro' his great love, wherewith he loved us,

Treasury of Scripture Knowledge

Summary

But thou, O Lord, art a God full of compassion, and gracious, longsuffering, and plenteous in mercy and truth.

Bible References

But thou

Romans 5:20
the law was introduc'd, that the greatness of the fall might fully appear; but the more sin display'd its enormity, the divine favour was so much the more transcendent.
Ephesians 1:7
who has by his blood obtained for us the redemption, even the forgiveness of our sins, according to the riches of his grace,
Ephesians 2:4
then it was that God, who is rich in mercy, thro' his great love, wherewith he loved us,