This covenant of grace is frequently set forth in scripture by the name of a testament, in reference to the death of Jesus Christ the Testator, and to the everlasting inheritance, with all things belonging to it, therein bequeathed. WCF 7.4
"For where a testament is, there must also of necessity be the death of the testator." - Hebrews 9:16
Resources
Considering Exceptions: Covenant or Testament? by Steve Tipton
The Covenant of Grace by Robert Riccaltoun
Terms for the Covenant by R. C. Sproul
The Division of Redemptive Special Revelation by Geerhardus Vos
Testament or Covenant by Richard Sibbes
Testament, Will, Covenant by Herman Witsius
Of Christ, The Testator Of The Covenant by John Gill
Testator (Forerunner Commentary)
Testator (Vines Dictionary)
The Blood of the Covenant by Rev. W. Reid Hankins, M.Div.
Why Hebrews 9 Is Referring To A Covenant Not To A Testament by Peter T O'Brian
Commentary on Hebrews Hebrews 9 by A. W Pink
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From John Ball's Treatise of the Covenant of Grace, p. 196:
It is called a Covenant and a Testament. A Covenant in respect of the manner of agreement; a Testament in respect of the manner of confirming. A Covenant in respect of God; a Testament in respect of Christ, who being appointed of the Father Lord and Prince, with full possession of all things necessary to Salvation, died as Testator, and confirmed by his death the testamentary promise before made, of obtaining the eternal inheritance by the remission of sins. John the Baptist by the light of preaching was greater than the Prophets, that had gone before him: but properly he was not a Minister of the new Testament, as it differed from the old: wherefore a middle place is rightly assigned to him, being the forerunner of Christ to prepare the way before him. From the birth of Christ, the things foretold in the old Testament pertaining to the constitution of the new, began to be fulfilled; and that first by his coming in the flesh, afterwards by his administration, and then by his death; by whose death the old Testament was abolished, and the new did succeed in the room thereof.
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Multimedia
Covenant Theology (MP3 Lecture Series by J. Ligon Duncan
Covenant Theology (MP3 Series) by O Palmer Robertson
Of God’s Covenant With Man (Ch.7, Sec.4-5) by Greg Bahnsen
A Gracious Covenant of Grace by Danny Hyde
The God Of Promise: Understanding Covenant in God’s Plan (6 Part Video Series by Derek Thomas
Covenant Theology (Video Lecture Series) by J. V. Fesko
The Covenant of Grace (MP3) The Jerusalem Chamber
Testament and Testator (MP3) The Jerusalem Chamber
The Covenant of Grace (MP3) by Richard Phillips
Marriage & the Covenant of Grace (MP3) by Nick Batzig
The Covenant of Grace (Video) by Lane G Tipton
The Covenant of Grace (Video) by John Gerstner
What is the Covenant of Grace? (YouTube) Jason Van Bemmel
The Covenant of Grace is Commonly Called a Testament (MP3) by Jim Dodson
More on Covenant Theology ....
eBooks
The Covenant of Grace (eBook) by Charles Hodge
A View of the Covenant of Grace (eBook) by Thomas Boston
Paradise Opened: A Treatise on the Covenants of Grace & Redemption (eBook) by Thomas Brooks
The Covenants of Works and Grace (eBook) by Walter Chantry
The Doctrine of the Two Covenants (eBook) by by Ezekiel Hopkins
Economy of the Covenants Between God and Man (eBook) by Herman Witsius
The True Bounds of Christian Freedom (eBook) by Samuel Bolton
A View of the Covenant of Grace (eBook) by Thomas Boston
Covenant of Grace (eBook) by John Murray
A Treatise on the Covenant of Grace (Archive) by John Ball
Books
Covenants Made Simple: Understanding God's Unfolding Promises to His People by Jonty Rhodes
The Doctrine of the Covenant and Testament of God by Johannes Cocceius
Covenant Theology by Peter Golding
Encountering Christ in the Covenants: An Introduction to Covenant Theology
by Daniel W. McManigal
The Covenant of Grace by Matthew Henry
Introducing Covenant Theology by Michael Horton
Christ of the Covenants by O Palmer Robertson
Sacred Bond: Covenant Theology Explored by Michael Brown and Zachary Keele