Samuel

Samuel is a historical book that documents the events immediately following the book of Judges. As such, it records the first known use of the phrase "Oh, thank God."

Authorship
The traditional belief that the prophet and the books originated when scholars noticed a striking congruence between the name Samuel and 1&2 Samuel (virtually identical if you remove the "1&2"). In modernity, this idea continues to be held by those who haven't actually read the book, seeing that Samuel dies like halfway through.

Contents
1 & 2 Samuel record the lineage of the first and second kings of Israel, Saul and David. Saul is known for having been a pretty terrible pick for the job and is therefore where we derive the colloquial saying, "you sure Saul'ed that one up." which means, "that was an okay first try."

Saul's throne is succeeded by David, a figure who most agree peaked in his high school years by killing Goliath, and only going on to become king over all of God's chosen nation. Though the David versus Goliath narrative is a classic idiomatic tale, first hand witnesses to the event are recorded as having been less surprised watching David kill a Giant with stones, having known that this kid spent all his mornings nailing lions left and right with those bad boys. David is most remembered for using a mere sling to kill the giant, Goliath, and least remembered for decapitating the guy immediately thereafter.

Legacy
David is the traditional author of some two-thirds of the songs that appear in the book of Psalms though most modern day scholars agree that he probably pirated most of them using a primitive bit-torrent client. To this day, however, he is still credited as having invented the psalmic style of music, which is now more commonly referred to as "polka."

In retrospect, the scholarly and religious communities agree that David was and is an important role model to all believers in the Abrahamic faith, as long as we sweep under the rug that time he committed adultery with a married woman and then had the husband assassinated in order to cover it up.