I will answer this with a single text and it was a statement from the angel of the Lord to Joseph…as this explains the entire reason Christ came and died on the cross:
Matthew 1:21She will give birth to a Son, and you are to give Him the name Jesus,d because He will save His people from their sins.”
If one wishes to do some further study on that bible doctrine, then id suggest one start studying the Old Testament Sanctuary Service. The Sanctuary explains the entire plan of salvation and it is fulfilled in Christs atoning death on the cross for the wages of sin (Romans 6:23). We also find that the book of Revelation goes on to describe exactly how it is that the scapegoat Azazeel will be punished for his deception of humanity and this closes off something that started with the first temptation in Genesis Chapter 3
1Now the serpenta was more crafty than any beast of the field that the LORD God had made. And he said to the woman, “Did God really say, ‘You must not eat from any tree in the garden?’ ”
I argue that one cannot have salvation without having had a fall in the first place…so Revelation is the end of the narrative that began in Genesis 1. This world started off sinless, and it will end the way it began…sinless!
Revelation 22
3No longer will there be any curse. The throne of God and of the Lamb will be within the city, and His servants will worship Him. 4They will see His face, and His name will be on their foreheads. 5There will be no more night in the city, and they will have no need for the light of a lamp or of the sun. For the Lord God will shine on them, and they will reign forever and ever.