Jesus is the Fulfillment

Jesus is the fulfillment of the Abrahamic Covenant (Covenant of Grace)

These are some helpful and comforting truths gleaned from John Fonville's sermon;
"2 Thessalonians: Praying for the Gospel, Part 3"

After the Fall, God promises this:"And I will put  enmity between you and the woman, And between your seed and her seed; He shall bruise you

on the head, And you shall bruise him on the heel." Bible teachers refer to Genesis 3:15 as "The Mother Promise of the whole Covenant of Grace." It is from this promise that the rest of the Scriptures begin to unfold... from this point forward the rest of the Bible tells the unfolding story of the faithfulness of God to fulfill His promise to send His Champion Seed from a Woman Who will come in victory for His people.
Promise:
The Scripture, foreseeing that God would justify the Gentiles by faith, *preached the gospel*  beforehand to Abraham, saying, “All the nations will be blessed in you.” ~Galatians 3:8Genesis 12:3 is the  Gospel in implicit promise. ~("And in you all the families of the earth will be blessed.”)
Psalm 105:8 He has remembered His covenant forever, The word which He commanded to a thousand generations

Psalm 100: 1 Shout joyfully to the Lord, *all the earth.*2 Serve the Lord with gladness; Come before Him with joyful singing. 3 Know that the Lord Himself is God; It is He who has made us, and not we ourselves;We are His people and the sheep of His pasture. 4 Enter His gates with thanksgiving And His courts with praise. Give thanks to Him, bless His name. 5 For the Lord is good; His lovingkindness is everlasting And His faithfulness to all generations. 

The Lord's ultimate and perfect fulfillment of His promise to Abraham doesn't come through the Nation of Israel. It comes through the True Israel, Who is Christ Himself. How do we know this? In Galatians 3:16

Paul is identifying the Offspring of Abraham as Christ."N ow the promises were spoken to Abraham and to his seed. He does not say, “And to seeds,” as referring to many, but rather to one, “And to your seed,” that is, Christ." Christ is the Offspring of Abraham through Whom all the Lord's promises come, to those who believe.

I Corinthians 1:20 For as many as are the promises of God,
*in Him* they are yes;
therefore also *through Him*
is our Amen to the glory of God through us.

Application: 

Remembering Peter's history of boasting > disloyalty > abandonment of the Lord, also remember the kindness > loyalty > faithfulness of our covenant-keeping, serpent-crushing Champion...Luke 22: 31 “Simon, Simon, behold, Satan has demanded permission to sift you like wheat; 32 *but I have prayed for you*, that your faith may not fail...”

Accomplished:
Colossians 2:14 having canceled out the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross. 15 When He had *disarmed the rulers and authorities, He made a public display of them, having triumphed over them through Him.  #SerpentCrusher #ChampionSeed

Consummation of the Abrahamic Covenant:

Revelation 5;9 And they sang a new song, saying,
“Worthy are You to take the book and to break its seals; for You were slain, and purchased for God with Your blood men *from every tribe and tongue and people and nation.*
10 “You have made them to be a kingdom and priests to our God; and they will reign upon the earth.”

You can hear the full sermon at: http://www.paramountchurch.com/mediaPlayer/#sermonaudio/352