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Peter preached to the crowd on the day of Pentecost to explain what had happened when Jesus was crucified. He explained that Jesus was accredited by God by miracles, wonders and signs to show that He was the Messiah, who was promised to the Jewish nation through the prophets. Peter added that Jesus was handed over to them by God's set purpose and foreknowledge:

Yet it was the will of the Lord to crush him with pain.
When you make his life an offering for sin,
he shall see his offspring, and shall prolong his days;
through him the will of the Lord shall prosper.

Isaiah 53:10

Why would God sacrifice His only begotten Son? Jesus did nothing to deserve death. He was sinless. He died for our sins.

For God so loved the world that he gave his only Son, so that everyone who believes in him may not perish but may have eternal life.

John 3:16

Scripture tells us God gave His Son (as a sin offering) so that whoever believes in Jesus (believes that His death and resurrection paid our debt of sin to God) will have everlasting life. God raised Jesus to life and declared to Him the title of Christ, the Anointed One, which is to say the Messiah.

Peter went on to say that everyone in the crowd should repent and be baptized, in the name of Jesus Christ for the forgiveness of their sins (the Greek indicates that the purpose of baptism is for the forgiveness of sin) and they would receive the gift of the Holy Spirit. "The promise is for you and your children and for all who are far off - for all whom the Lord our God will call."

That means the promise is for you also, if you want peace with God. Jesus is our Peace.

At His Maundy Thursday, Jesus told His disciples "this is My body, this is My blood". We recognize His Body and Blood in the sacrament of "The Lord's Supper" (or "Holy Communion"). We also remember the price at which our salvation was bought.