ISB ~ 2 Thessalonians 2 v8

Jesus will slay him:Christ will descend from heaven as a divine Warrior to destroy the man of lawlessness with a word and trample the last remnants of evil underfoot (1 Cor 15:24).

the breath of his mouth:Or, “the Spirit of his mouth”.

• Paul is alluding to Is 11:4, where the Messiah appears as a judge who vindicates the poor and oppressed and slays the wicked with his powerful word.