1 John 2:2

and he is the propitiation for our sins; but not for ours alone, but also for the whole world.

1 John 4:10

Herein is love, not that we loved God, but that he loved us, and sent his Son a propitiation for our sins.

John 4:42

and they said to the woman, It is no longer on account of thy saying that we believe, for we have heard him ourselves, and we know that this is indeed the Saviour of the world.

1 John 4:14

And we have seen, and testify, that the Father has sent the Son as Saviour of the world.

John 1:29

On the morrow he sees Jesus coming to him, and says, Behold the Lamb of God, who takes away the sin of the world.

John 11:51-52

But this he did not say of himself; but, being high priest that year, prophesied that Jesus was going to die for the nation;

John 12:32

and I, if I be lifted up out of the earth, will draw all to me.

Romans 3:25-26

whom God has set forth a mercy-seat, through faith in his blood, for the shewing forth of his righteousness, in respect of the passing by the sins that had taken place before, through the forbearance of God;

2 Corinthians 5:18-21

and all things are of the God who has reconciled us to himself by Jesus Christ, and given to us the ministry of that reconciliation:

1 Peter 2:24

who himself bore our sins in his body on the tree, in order that, being dead to sins, we may live to righteousness: by whose stripes ye have been healed.

1 Peter 3:18

for Christ indeed has once suffered for sins, the just for the unjust, that he might bring us to God; being put to death in 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 wicked one.

Revelation 12:9

And the great dragon was cast out, the ancient serpent, he who is called Devil and Satan, he who deceives the whole habitable world, he was cast out into the earth, and his angels were cast out 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
Herein is love, not that we loved God, but that he loved us, and sent his Son a propitiation for our sins.
Romans 3:25
whom God has set forth a mercy-seat, through faith in his blood, for the shewing forth of his righteousness, in respect of the passing by the sins that had taken place before, through the forbearance of God;
1 Peter 2:24
who himself bore our sins in his body on the tree, in order that, being dead to sins, we may live to righteousness: by whose stripes ye have been healed.
1 Peter 3:18
for Christ indeed has once suffered for sins, the just for the unjust, that he might bring us to God; being put to death in flesh, but made alive in the Spirit,

For the

1 John 4:14
And we have seen, and testify, that the Father has sent the Son as Saviour of the world.
1 John 5:19
We know that we are of God, and the whole world lies in the wicked one.
John 1:29
On the morrow he sees Jesus coming to him, and says, Behold the Lamb of God, who takes away the sin of the world.
John 4:42
and they said to the woman, It is no longer on account of thy saying that we believe, for we have heard him ourselves, and we know that this is indeed the Saviour of the world.
John 11:51
But this he did not say of himself; but, being high priest that year, prophesied that Jesus was going to die for the nation;
2 Corinthians 5:18
and all things are of the God who has reconciled us to himself by Jesus Christ, and given to us the ministry of that reconciliation:
Revelation 12:9
And the great dragon was cast out, the ancient serpent, he who is called Devil and Satan, he who deceives the whole habitable world, he was cast out into the earth, and his angels were cast out with him.

General references

Exodus 37:6
And he made a mercy-seat of pure gold; two cubits and a half the length thereof, and one cubit and a half the breadth thereof.
Exodus 40:6
And thou shalt set the altar of burnt-offering before the entrance of the tabernacle of the tent of meeting.
Leviticus 14:29
And the remainder of the oil that is in the priest's hand he shall put upon the head of him that is to be cleansed, to make atonement for him before Jehovah.
Leviticus 23:28
And ye shall do no manner of work on that same day; for it is a day of atonement, to make atonement for you before Jehovah your God.
Ezekiel 33:16
None of his sins which he hath committed shall be remembered against him: he hath done judgment and justice; he shall certainly live.
Hebrews 8:12
Because I will be merciful to their unrighteousnesses, and their sins and their lawlessnesses I will never remember any more.