2 Thessalonians 2:3

3 aLet no one deceive you in any way. For that day will not come, bunless the rebellion comes first, and cthe man of lawlessness
Some manuscripts sin
is revealed, ethe son of destruction,
Greek  the son of perdition (a Hebrew idiom)

2 Thessalonians 2:7-8

7For gthe mystery of lawlessness his already at work. Only he who now restrains it will do so until he is out of the way. 8And then ithe lawless one will be revealed, whom the Lord Jesus jwill kill with kthe breath of his mouth and bring to nothing by lthe appearance of his coming.
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