1 John 1:9

[But] if we confess our sins [to God], He is faithful [to His promise] and righteous [in His judgment], and will forgive us of those sins and cleanse us from all of our wrongdoing.

1 John 1:7

But, if we live in the light [of righteousness] just like God [constantly] lives in the light [of righteousness], we can truly share a relationship with one another and [can know that] the blood of Jesus, God's Son, continues to cleanse [our spirits] from all of our sins.

Titus 2:14

He gave Himself up for us, to buy us back from [enslavement to] all [kinds of] wickedness and to purify for Himself a group of people who belong to Him and who are eager to do good deeds.

Romans 3:26

[In doing this] God [also] demonstrated His justice [to people] of this present time, that He Himself is just and the One who makes the people right with Him who have faith in Jesus.

1 Corinthians 6:11

And some of you have practiced such things, but you were washed [i.e., from your sins. See Acts 22:16]; you were dedicated [i.e., set apart for God's service]; you were made right with God in the name [i.e., by the authority] of the Lord Jesus Christ, and by the Holy Spirit of our God.

Matthew 3:6

and people were immersed by him in the Jordan River as they confessed their sins.

Mark 1:5

And people from throughout all the regions of Judea and all of Jerusalem went out to John [in the desert]. And he immersed them in the Jordan River as they confessed their sins.

Acts 19:18

Many of the believers also came confessing their sins and describing what they had [previously] done.

1 Corinthians 1:9

God is faithful [i.e., He will continue working among you] and it is through Him that you were called into the fellowship of His Son Jesus Christ our Lord.

Ephesians 5:26

so that He could dedicate her [to Himself], after cleansing her by means of the washing of water [i.e., immersion], accompanied by the word. [Note: "The word" here refers either to a person's profession of faith (See Rom. 10:9) or to the Gospel message (See Rom. 10:17), both of which are associated with immersion].

1 Timothy 1:15

This saying is trustworthy and deserves to be fully accepted: Christ Jesus came into the world to save sinners, and I am the worst of them all.

Hebrews 6:10

For God is not [so] unjust as to forget the work you are doing and the love you have shown for Him, as you ministered to the saints [i.e., His holy people] and continue to minister [to them].

Hebrews 10:23

[So], we should hold on firmly to the profession of our hope [in God], without wavering from it, for God is faithful to His promises.

Hebrews 11:11

By [having] faith, Sarah herself received the ability to have children, even though she was [sterile, being] past the age of child-bearing, since she considered God faithful to His promise. [Note: Some translations consider "Abraham" to be the subject of this highly controversial verse. See Lightfoot, pages 222-225].

Revelation 15:3

And they were singing the song of Moses, the servant of God, and the song of the Lamb. [The words were], "Your deeds are great and marvelous, O Lord, God Almighty; your ways are just and true, O King of the nations [or, "ages"].

Treasury of Scripture Knowledge

Summary

If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

General references

Bible References

We confess

Matthew 3:6
and people were immersed by him in the Jordan River as they confessed their sins.
Mark 1:5
And people from throughout all the regions of Judea and all of Jerusalem went out to John [in the desert]. And he immersed them in the Jordan River as they confessed their sins.
Acts 19:18
Many of the believers also came confessing their sins and describing what they had [previously] done.

He is

1 Corinthians 1:9
God is faithful [i.e., He will continue working among you] and it is through Him that you were called into the fellowship of His Son Jesus Christ our Lord.
1 Timothy 1:15
This saying is trustworthy and deserves to be fully accepted: Christ Jesus came into the world to save sinners, and I am the worst of them all.
Hebrews 10:23
[So], we should hold on firmly to the profession of our hope [in God], without wavering from it, for God is faithful to His promises.
Hebrews 11:11
By [having] faith, Sarah herself received the ability to have children, even though she was [sterile, being] past the age of child-bearing, since she considered God faithful to His promise. [Note: Some translations consider "Abraham" to be the subject of this highly controversial verse. See Lightfoot, pages 222-225].

Just

Romans 3:26
[In doing this] God [also] demonstrated His justice [to people] of this present time, that He Himself is just and the One who makes the people right with Him who have faith in Jesus.
Hebrews 6:10
For God is not [so] unjust as to forget the work you are doing and the love you have shown for Him, as you ministered to the saints [i.e., His holy people] and continue to minister [to them].
Revelation 15:3
And they were singing the song of Moses, the servant of God, and the song of the Lamb. [The words were], "Your deeds are great and marvelous, O Lord, God Almighty; your ways are just and true, O King of the nations [or, "ages"].

And to

1 John 1:7
But, if we live in the light [of righteousness] just like God [constantly] lives in the light [of righteousness], we can truly share a relationship with one another and [can know that] the blood of Jesus, God's Son, continues to cleanse [our spirits] from all of our sins.
1 Corinthians 6:11
And some of you have practiced such things, but you were washed [i.e., from your sins. See Acts 22:16]; you were dedicated [i.e., set apart for God's service]; you were made right with God in the name [i.e., by the authority] of the Lord Jesus Christ, and by the Holy Spirit of our God.
Ephesians 5:26
so that He could dedicate her [to Himself], after cleansing her by means of the washing of water [i.e., immersion], accompanied by the word. [Note: "The word" here refers either to a person's profession of faith (See Rom. 10:9) or to the Gospel message (See Rom. 10:17), both of which are associated with immersion].
Titus 2:14
He gave Himself up for us, to buy us back from [enslavement to] all [kinds of] wickedness and to purify for Himself a group of people who belong to Him and who are eager to do good deeds.

General references

1 Corinthians 11:31
But if we [had] examined ourselves [properly], we would not be [i.e., not have been] judged [i.e., with sickness and death. See verse 30].
Hebrews 8:12
For I will be merciful to their wickedness [i.e., by forgiving them] and I will not remember their sins anymore."