Edited sentence: And so it was also a foreshadowing of the deliverance of all God's people, for it was by death of the son of the king (Jesus Christ being the Son of God) that the people were freed from their bondage to sin and eternal death.Because this plague took place on the evening of the 13th (it being a Friday as the Jewish Sabboth takes place on Saturday) is why Fridays that fall on the 13th day of the month acquired the superstition that it was a bad day and it is also why the number 13 has a phobia  attached to it.But according to the reckoning of the Egyptian/Gentile calendar, it was Friday night on the 13th of the month.Each of the 10 plagues was a direct revelation/attack on.Each of the next plauges also brought down one by one, one of the gods of the Egyptian people (it was a demonstration of YHWH's true diety as opposed to the false diety of the Egyptian gods), and finally with the 10th plague, God brought down Pharoh.Friday the 13th was the day of deliverance for the people of Isreal from the Egyptian (gentile) perspective.So, since the Jewish day begins and ends with sundown, the passover took place on the 14th of Nisan.The River Nile was worshipped as a God (it was the life force of Egypt because it irrigated the delta region and provided food) hence it was the 1st "god" that God dealt with.The death of the "son of the Egyptian God "Pharoh" is interesting in that it was through the sacrifice of a son, an innocent son, that God's people were freed.The first born son of Pharoh died when the angel of death visited the land of Egypt.The most likely Biblical explanation for Friday the 13th comes from the final plague which God used to bring Egypt to its knees and demonstrate his diety to them and to accomplish the release of His people Isreal.To the Egyptians, Pharoh was God on earth, and hence to show him to not be god was necessary.the gods of Egypt