1 John 2:2

And he is the atoning sacrifice for our sins, and not for ours only, but also for the whole world.

1 John 4:10

In this is love, not that we loved God, but that he loved us, and sent his Son as the atoning sacrifice for our sins.

John 4:42

They said to the woman, "Now we believe, not because of your speaking; for we have heard for ourselves, and know that this is indeed the Christ, the Savior of the world."

1 John 4:14

We have seen and testify that the Father has sent the Son as the Savior of the world.

John 1:29

The next day, he saw Jesus coming to him, and said, "Behold, the Lamb of God, who takes away the sin of the world!

John 11:51-52

Now he didn't say this of himself, but being high priest that year, he prophesied that Jesus would die for the nation,

John 12:32

And I, if I am lifted up from the earth, will draw all people to myself."

Romans 3:25-26

whom God set forth to be an atoning sacrifice, through faith in his blood, for a demonstration of his righteousness through the passing over of prior sins, in God's forbearance;

2 Corinthians 5:18-21

But all things are of God, who reconciled us to himself through Jesus Christ, and gave to us the ministry of reconciliation;

1 Peter 2:24

who his own self bore our sins in his body on the tree, that we, having died to sins, might live to righteousness; by whose stripes you were healed.

1 Peter 3:18

Because Christ also suffered for sins once, the righteous for the unrighteous, that he might bring you to God; being put to death in the flesh, but made alive in the spirit;

1 John 1:7

But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus Christ, his Son, cleanses us from all sin.

1 John 5:19

We know that we are of God, and the whole world lies in the power of the evil one.

Revelation 12:9

The great dragon was thrown down, the old serpent, he who is called the devil and Satan, the deceiver of the whole world. He was thrown down to the earth, and his angels were thrown down with him.

Treasury of Scripture Knowledge

Summary

And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.

Bible References

He is

1 John 1:7
But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus Christ, his Son, cleanses us from all sin.
1 John 4:10
In this is love, not that we loved God, but that he loved us, and sent his Son as the atoning sacrifice for our sins.
Romans 3:25
whom God set forth to be an atoning sacrifice, through faith in his blood, for a demonstration of his righteousness through the passing over of prior sins, in God's forbearance;
1 Peter 2:24
who his own self bore our sins in his body on the tree, that we, having died to sins, might live to righteousness; by whose stripes you were healed.
1 Peter 3:18
Because Christ also suffered for sins once, the righteous for the unrighteous, that he might bring you to God; being put to death in the flesh, but made alive in the spirit;

For the

1 John 4:14
We have seen and testify that the Father has sent the Son as the Savior of the world.
1 John 5:19
We know that we are of God, and the whole world lies in the power of the evil one.
John 1:29
The next day, he saw Jesus coming to him, and said, "Behold, the Lamb of God, who takes away the sin of the world!
John 4:42
They said to the woman, "Now we believe, not because of your speaking; for we have heard for ourselves, and know that this is indeed the Christ, the Savior of the world."
John 11:51
Now he didn't say this of himself, but being high priest that year, he prophesied that Jesus would die for the nation,
2 Corinthians 5:18
But all things are of God, who reconciled us to himself through Jesus Christ, and gave to us the ministry of reconciliation;
Revelation 12:9
The great dragon was thrown down, the old serpent, he who is called the devil and Satan, the deceiver of the whole world. He was thrown down to the earth, and his angels were thrown down with him.

General references

Exodus 37:6
He made a mercy seat of pure gold. Its length was two and a half cubits, and a cubit and a half its breadth.
Exodus 40:6
"You shall set the altar of burnt offering before the door of the tabernacle of the Tent of Meeting.
Leviticus 14:29
The rest of the oil that is in the priest's hand he shall put on the head of him who is to be cleansed, to make atonement for him before Yahweh.
Leviticus 23:28
You shall do no kind of work in that same day; for it is a day of atonement, to make atonement for you before Yahweh your God.
Ezekiel 33:16
None of his sins that he has committed shall be remembered against him: he has done that which is lawful and right; he shall surely live.
Hebrews 8:12
For I will be merciful to their unrighteousness. I will remember their sins and lawless deeds no more."