The sixth aliyah contains the tenth plague: the slaying of the first- born. At midnight G-d passes through Egypt slaying all the first born of everyone from Pharaoh down to the captives in the dungeon, and a very great cry is heard throughout Egypt.
Pharaoh arose and searched for Moshe and said, "Go serve your G-d and pray for me" (because Pharaoh was also a first born).
The Jews ask their Egyptian neighbors for silver and gold vessels and the Egyptians cooperated so much that they gave double what was asked for. The Jews left Egypt hurriedly without their bread leavening.
We observe our first Passover Seder on the same night (of each year) as this redemption took place. The first Seder night is considered a "night of watching", and is to be considered so forever (it is guarded for all time against evil doers).
