Then Samuel told the people the manner of the kingdom, and wrote it in a book, and laid it up before the LORD. And Samuel sent all the people away, every man to his house. The manner of the kingdom - It is the same word as in 1 Samuel 8:9; and doubtless the same thing is implied as is there related. But possibly there was some kind of compact or covenant between them and Saul; and this was the thing that was written in a book, and laid up before the Lord, probably near the ark.
Related Commentaries of 1 Samuel 10:25
1 Samuel 10:25
25 Then Samuel told the people the manner of the kingdom, and wrote it in a book, and laid it up before the LORD. And Samuel sent all the people away, every man to his house.