In Short

1

God promised to send a Savior after the first sin.

“And I will put enmity
between you and the woman,
and between your offspring and hers;
he will crush your head,
and you will strike his heel.”
Genesis 3:15 (God speaking to the devil)

“All the prophets testify about [Jesus] that everyone who believes in him receives forgiveness of sins through his name.”
Acts 10:43

“The reason the Son of God appeared was to destroy the devil’s work.”
1 John 3:8

2

The Savior Jesus came and paid the penalty for our sins.

“The next day John saw Jesus coming toward him and said, ‘Look, the Lamb of God, who takes away the sin of the world!'”
John 1:29

“God made him who had no sin to be sin for us, so that in him we might become the righteousness of God.”
2 Corinthians 5:21

“For Christ died for sins once for all, the righteous for the unrighteous, to bring you to God.”
1 Peter 3:18

3

The promise of forgiveness through Jesus is for all people.

“Then [Jesus] opened their minds so they could understand the Scriptures.  He told them, ‘This is what is written: The Christ will suffer and rise from the dead on the third day, and repentance and forgiveness of sins will be preached in his name to all nations.'”
Luke 24:45-47

“[Jesus Christ, the Righteous One] is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world.”
1 John 2:1-2