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And he brought out the people that were in it, and cut them with saws, and with harrows of iron, and with axes. Even so dealt David with all the cities of the children of Ammon. 20:3
Trivia: How many men did Abishai kill with his spear at one time?
The first nine chapters of First Chronicles are good examples of the "endless genealogies" that Paul tells us to avoid (see 1 Timothy 1:4 and Titus 3:9).
Wearisome as these chapters are, the rest of the book isn't much better. Consequently, First Chronicles is probably the most boring book in the Bible -- maybe the most boring book in all of literature.
First Chronicles covers the same material that is covered elsewhere in the Bible, adding a lot of contradictions while making it even more boring.
Highlights (such as they are):