According to 2 Kings 22:8 priests found a book of law in the Jerusalem temple during the renovations undertaken during the reign of King Josiah. Biblical scholars say this book, the Book of Deuteronomy, was not so much rediscovered, but written and placed in the Temple so that it could be "found" there and declared an ancient manuscript. A very similar case is reported in the Book of Jeremiah some years later, demonstrating that this would not be the only case in which a document was hidden then 'found' by the priests.
For more information on the second book of Law, please visit:
http://christianity.answers.com/bible/the-book-of-deuteronomy
All of the priests (Cohens) did that, beginning with Moses' brother Aaron, until the destruction of the Second Temple by the Romans in 70 CE.
The book of the Law was found in the temple during the eighteenth year of King Josiah's reign - see Kings 22:3-8.
The Law of Moses, found in the Old Testament of the Bible, contains prophecies and foreshadowing about Jesus, the Messiah. It foretells of a coming savior who would fulfill the law and bring salvation to humanity.
The presentation of Jesus in the temple was to fulfil the Law (Exodus 13:2;12-15). Jesus while on earth was very careful to fulfil the Law of Moses, and so also did His mother and Joseph as they were believers in God and His laws.
Jesus was presented in the temple as a baby according to Jewish tradition for the purpose of fulfilling the requirements of the Law of Moses, specifically the redemption of the firstborn male child and the purification of the mother after childbirth.
The mitzvot (commands) given to the Jewish people through Moses by God, are found in the Torah. The halachot (details of the laws) and traditions of the Jewish people are found in the Talmud.
Stephen was stoned to death because the Jewish leaders believed he had spoken blasphemous words against the temple, the law, and the customs from Moses.
Moses did not have a "stepfather-in-law" since his wife, Zipporah, never had a stepfather. Moses' father-in-law was Jethro.
No they were not given to Moses.
The Code of Hammurabi, of which we have a copy, dates from the beginning of the seventeenth century BCE. We have no firm evidence that the law of Moses ever really existed other than as a late tradition, but the biblical account is believed to place it around 1400 BCE. So, the Code of Hammurabi would be much older than the law of Moses.
And when the days of her purification according to the law of Moses were accomplished, they brought him to Jerusalem, to present him to the Lord; Luke 2:22
Jethro, Moses' father-in-law, was affiliated with the religion of Midianism.