For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth
- Romans 1:16 -
As it is written, There is none righteous, no, not one
- Romans 3:10 -
For all have sinned, and come short of the glory of God
- Romans 3:23 -
But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us
- Romans 5:8 -
For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord
- Romans 6:23 -
For whosoever shall call upon the name of the Lord shall be saved
- Romans 10:13 -
Passover's annual celebration commemorates Israel's escape from Egypt, where they had been enslaved by a jealous and paranoid people. When Israel was a young nation, they had sought shelter in Egypt to escape famine. At first living in Egypt was very comfortable, but after 400 years, they found themselves under increasingly unbearable circumstances. They cried out to God for help and God responded with a prophet leader for Israel and a plan that culminated in the death of an innocent lamb.

Moses was told to demand of the Pharaoh that he let God's people go. When Pharaoh refused, God caused the Egyptians to experience increasingly devastating plagues. Rather than soften the Pharaoh's heart, the plaques had the opposite affect and the Pharaoh was dead set against releasing the Israelites. God had forewarned Moses that this would happen, but He also revealed the last phase of His plan which would assuredly resolve the stalemate.
The Bible records in Exodus 12 that God, through Moses, instructed the Israelites to take a lamb without blemish from their flock on the tenth day of the month. They should take care of the lamb for four days and then kill it on the evening of the fourteenth day. They were then instructed to take the blood of the lamb and apply it to the doorways of their homes. The Israelites should also roast the lamb and eat it with bitter herbs and unleavened bread. The lamb should be completely eaten with all leftovers being consumed by fire before the next morning.

God warned that He would pass through Egypt during the night and kill the first born of any house that lacked the blood of a lamb on the door posts. He also promised to pass over any house that had the requisite blood and do no harm to the inhabitants therein.
The Israelites followed God's instructions and the results were dramatic. They escaped the judgment of God, while the Egyptians experienced death on a national scale. When the Pharaoh saw the complete devastation which affected every Egyptian home, he called Moses and ejected Israel from the land that very same night. This episode defined Israel as God's chosen people.
When John called Jesus the Lamb of God, the people who heard could not help but anticipate national salvation on a similar scale.