This Shabbat is also known as Shabbat HaGadol
Leviticus 6:8 (1)-8:36, 9:22-23
Jeremiah 7:21-8:3, 9:22-23
Torah portion summary includes commands to Aaron and his sons about:
Elevation offering and the altar fire
Instruction about eating in a state of Contamination
Consecration of Aaron and his sons, the Kohanim
The following is taken from notes of the HafTorah of Tzav in the Stone edition of the Chumash:
The Sabbath before Pesach is called Shabbat HaGadol, the Great Sabbath, because in Egypt it was the day when GOD's people took the sheep to a bedpost and informed the infuriated Egyptians that the sheep, an Egyptian deity, would become an offering to GOD. The Jewish people obeyed the words given by GOD thru Moses His servant. Thus the Sabbath before redemption was a day when GOD's people showed faith and were rewarded with His protection.
The following is taken from Moses.com:
Today, practically every pulpit rabbi delivers a homily every Shabbat. This wasn't always the case. In Jewish communities of old, the rabbi would speak to the congregation twice a year: On Shabbat Shuvah (the Shabbat between Rosh Hashanah and Yom Kippur) the rabbi would speak about the importance of doing Teshuvah, and would remind the people of the numerous laws associated with the holiday of Sukkot (Sukkot is five days after Yom Kippur). And on Shabbat HaGadol the rabbi would discuss in his sermon some of the practical laws associated with Pesach.
Many communities read a special HafTorah (Malachi 3:4-24) which discusses "bring[ing] the entire tithe to the storehouse [of God]." In some communities this HafTorah is only read if Shabbat HaGadol is actually on the day before Pesach. The reason for reading a HafTorah about tithing is as follows: In the Land of Israel, tithes must be separated from all produce. Some is given to the Kohen, some to the Levite, some to the poor, and some simply had to be eaten in Jerusalem. On the day before Pesach, on the third and sixth year of the seven-year sabbatical cycle, one was required to ascertain that none of these tithes remained in his/her possession. Any remaining tithes had to be distributed to their proper owners or destroyed.
These biblical verses from Malachi 3:16-18; tell us that there is always a faithful remnant who fear GOD, obey Him, and exercise discernment. GOD sees these people and records their names. This indicates that GOD will never forget and will rightly judge the good deeds of the righteous and the evil deeds of the wicked.
Shavua Tov & Hag Sameach Pesach (Happy Passover)