Impurities removed from molten metal during refining. In a spiritual sense, wicked people whom God removes in judgment, and also impurities in believers which are removed by discipline and trials.

Psalms 119:119

God removes the wicked like dross

See also

Isaiah 30:28
Jeremiah 6:28-30
Ezekiel 22:19-22
Ezekiel 22:18

Dross as a metaphor for impurity in God's people

See also

Isaiah 1:21-23
Ezekiel 24:11-13; 36:25
Amos 9:8-10
James 1:21
Isaiah 1:25-26

God purges the dross from his people

See also

Proverbs 17:3; 25:4
Daniel 12:10
Malachi 3:2-3
2 Corinthians 7:1
1 Peter 1:7
Zechariah 13:1
Hebrews 9:14

By the blood of Jesus Christ

1 John 1:7
Ezekiel 36:25-27
Matthew 3:11-12

By the work of the Holy Spirit

Psalms 66:10-12

pp Lk 3:16-17

Isaiah 48:10

By testing and affliction

Jeremiah 9:7
Zechariah 13:9

See also

3233 Holy Spirit & sanctification
4303 metals
4345 metalworkers
4351 refining
5322 gallows
5593 trial
5979 waste
6744 sanctification
7416 purification
8324 purity
8832 testing
9210 judgment, God's