Acts 19:18

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

Matthew 3:6

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

Romans 10:10

For a person believes [in Christ] with his heart in order to be made right with God, and he makes a profession with his lips in order to be saved.

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.

Treasury of Scripture Knowledge

Summary

And many that believed came, and confessed, and shewed their deeds.

Bible References

Confessed

Matthew 3:6
and people were immersed by him in the Jordan River as they confessed their sins.
Romans 10:10
For a person believes [in Christ] with his heart in order to be made right with God, and he makes a profession with his lips in order to be saved.
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.