Earlier today I came across this statement that took me by surprise. Below, Ellen White is clear that the Book of the Covenant is a distinct part the books of Moses and she give a good hint of what part that is:

She gives some more information on the contents of this book here:

Based on the above information I review Deuteronomy today to see what part or parts constitute the Book of the Covenant. My conclusion? The fourteen chapters from 12 to 26. See what you think. This isn't a testing truth but it is a helpful insight that the Lord is sharing with us through Ellen White - that there was indeed a Book of the Covenant. This 1) helps explain the several references of Sister White to the importance and significance of the solemn ceremony and pledge that sealed the covenant between God and Israel, 2) it confirms that the covenant was very specific and the people were fully aware of its terms, 3) it helps us in modern times to see the unchanging relationship between obedience and divine blessing, disobedience and divine cursing, 4) it also helps us litigious moderns to see the mutual contractual obligations and benefits and privileges existing between God and His people and 5) it helps to re-establish a proper balance between grace, faith and works.

Note: According to Wikipedia the Book of the Covenant is generally viewed among academics as Exodus 20:19 to 23:33. That imo is the summarized version but the chapters I mentioned are the full text version. As I reviewed Deuteronomy, what I was looking for was the expanded version of Exodus 20:19 to 23:33, and this is why I have pointed to those chapters.

The academics could well be correct that the summary version is the format that was used at Sinai which was broken almost immediately, but the fuller version is the one used on the boarders of the Promised Land when the covenant was renewed. It is this fuller covenant that bound the people to the Lord and the Lord to His people as they entered into their conquest of Canaan and under His leadership took possession of their inheritance.

Deuteronomy was the book of the covenant in the Old Testament.
Revelation is the book of the covenant in the New Testament.

An interesting study is to see the parallels between the two.

One interesting historical point:

The book of Deuteronomy is a summary of that covenant. And in Deuteronomy we find the command that all the kings of Israel are to take a scroll of a copy of this covenant and have it with him and read it every day of his life so that he may learn to revere God and follow carefully all the words of this covenant with it’s laws and decrees. (Deut. 17:19)

So, when David, by solemn ceremony, was consecrated to his office as king over Israel. The sceptre was placed in his hands. The scroll of the covenant in which was written God’s directions on righteous sovereignty was placed in his hands for him to follow and read daily, and the people gave their pledges of loyalty. The crown was placed upon his head, and the coronation ceremony was over. Israel had a king by divine appointment. (See 2 Samuel 5:3, 2Kings 11:10-12, 2 Cor. 23:10-11)

Revelation 4-6
describes the enthronement and inauguration into the Royal Priesthood of Christ. Jesus, as the lion of the tribe of Judah, the root of David, is seen here as the administrator, who, on the basis of the saving work of His death, (the Lamb slain) and priestly ministry now receives the authority to administer the specifications of the covenant upon His church.
He receives the scroll that must be given to someone who is worthy to administer the covenant promises and provisions outlined therein.