Book of Ecclesiastes
The Book of Ecclesiastes was written by the son of David, whom many think is Solomon though unconfirmed. There are 12 chapters in Ecclesiastes, and the common theme in the book is to live under God's commandments but to also enjoy life.
Also, Ecclesiastes makes a point to tell readers that we should fear God - that is, respect and honor Him. There are also references to the coming Messiah in this book, such as 12:11 which points out the Davidic Messiah being the "one shepherd."
Read through the entirety of Ecclesiastes and check out the summaries, meanings, and commentaries on each verse.