Passover is one of the spring festivals that God ordained that the Jews observe. Called Pasach in Hebrew, this festival commemorated the exodus from Egypt, and the Passover rituals prophetically foreshadow the death of the Messiah in 32 AD.

The Passover Seder for those at home
The Seder starts at 6:00 PM and must be finished by 12:00AM. On the table is a special cloth container with three pockets called a Matzah-Tash with a loaf of unleavened bread in each pocket. (symbolizing the Trinity) The  middle loaf of unleavened bread, or matzah, is taken out and torn in two. The smaller piece is placed back in between the other two. The larger peace is wrapped in a napkin and hidden (symbolizing the death and burial of the second person of the Trinity, the Son).  It will be used later for the Afikomen. Then the story of the exodus from Egypt is told, and the group sings Psalms 113-114.

Then the father brings out the lower peace of Matzah from the Matzah-Tash blesses it then each member eats a small peace of the bread (symbolizing the Holy Spirit, third person of the Trinity).

Then the Passover meal is eaten, which may take an hour or two. The father wraps part of the middle piece of Matzah in a white cloth and hides it some where in the house. (symbolizing the death and burial of the Messiah). After the meal the father sends the children to hunt for hidden Matzah. The Seder cannot continue until the Matzah is found and given back to the father (symbolizing the resurrection and ascension of the Messiah). The child negotiates what gift the father will give him for returning the Matzah. Then the father gives the child a coin as a down payment for the gift and the matzah is returned and the Seder can continue. This gift of a coin referred to as "the promise of the father" (symbolizing the giving if the Holy Spirit at Pentecost as a earnest deposit of the gift of eternal life).

Then the father brings out the Matzah that was hidden, each member is given two peaces of matzah to make the Afikomen. The  Afikomen is a sandwich made of two peaces of matzah with the Maror (bitter herbs) on one side and the Charoset (a sweet antidote to the bitter herbs) on the other side. The sandwich is eaten Maror side first then Charoset (symbolizing that the Messiah is the only antidote for sin).

Since it is was forbidden to eat the Passover lamb anywhere except Jerusalem (Deuteronomy 16:5), together they say "I am observing this commandment so I may remember the Passover lamb eaten at the end of the Seder. May the eating of the Afikomen achieve all the spiritual things accomplished by the Passover lamb itself." If one placed the blood of the Passover lamb on the door post the death angel would not kill the first born in the house, so salvation was offered if you believed in the blood of the Passover lamb.

Then Psalm 126 is sung and they drink the third cup of wine. Then the fourth cup, the cup of  Elijah  is poured. Then they sing the Hallel - Psalms 115-118,136.

Matzah is pierced and has stripes from being cooked unleavened. Compare Isaiah 53.

Meanwhile in the Temple...
In the time of Jesus, the high priest, on the 10th of Nisan, would go to Bethany to get an unblemished lamb and bring it into the temple to be inspected for four days. As the lamb was brought to the eastern gate, pilgrims would line the sides, wave the palm branches, and say "Baruch Ha Shem Adonai," Psalm 118:26-27. Jesus left the house of Lazarus in Bethany on the 10th to go teach in the temple, where the scribes asked their hardest questions of Jesus and walked away saying "never a man spoke as this man." At 9:AM on the 14th of Nisan, the lamb was tied on one of the horns of the alter and at 3:PM the high priest would slay the lamb while saying the words, "It is finished." These words are said at any "shelem" or peace offering.