Passover the “Festival of Freedom” starts tonight at sundown. Jesus ate the Passover meal in Jerusalem with His disciples (the Last Supper) to celebrate Pharaoh releasing the Israelite’s from 400+ years of Egyptian slavery, and proving the God of Israel — The God of Abraham, Issac and Jacob -- was the only all-powerful and mighty GOD.
We know about the 10 Plagues of Egypt — that the Israelites were protected in the midst of them. We remember the 10th where every firstborn child was "passed over" if they were in a home marked with the Blood of a slaughtered Lamb.
Pharaoh had mocked God saying, "Who [is] the LORD, that I should obey his voice to let Israel go?” Each plague contrasted the power of the God of Israel with the Egyptian gods and totally invalidated them. In the final plague Pharaoh lost his own firstborn. "On that same night I will pass through Egypt and strike down every firstborn of both people and animals, and I will bring judgment on all the gods of Egypt. I am the LORD.” Passover is still celebrated worldwide. (see Exodus)