His Death

"For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures" 
 - 1 Corinthians 15:3
What could it mean that Christ "died for our sins"? 

As the Lamb of God 1 , it was fitting for Jesus to die during the Jewish Passover2 . The blood of the original passover lamb was a "sign 3 " -- applied to the portal between slavery (in Egypt) and freedom. Similarly, Jesus blood was also smeared on a portal: the cross. When we choose to follow Jesus through it, we will find true freedom (from sin) and eternal life .
"For God so loved the world that he gave his only Son that whoever believes in him should not perish but have eternal life"  - John 3:16
​​​When Jesus' disciples didn't understand this principle 4 , he explained it to them with these words: "Whoever wants to be my disciple must deny himself and take up his cross and follow me. For whoever wants to save his life will lose it, but whoever loses his life for me will find it. What good will it be for someone to gain the whole world, yet forfeit his soul? Or what can anyone give in exchange for his soul? (Matthew 16:24,25)"
"For the word of the cross is folly to those who are perishing, but to us who are being saved it is the power of God."  - 1 Corinthians 1:18
"For Christ also suffered once for sins, the righteous for the unrighteous, that he might bring us to God"​ - 1 Peter 3:18