Therefore repent! Otherwise I will come to you shortly and wage war against them with the sword of My mouth.
Christ speaks here as the One bearing the sharp two-edged sword because Pergamos was plagued with corruptors of faith and morals; He comes resolved to fight them by the sword of His word. The word of God cuts every way, no heart too hard, no sin-habit too deeply rooted that it cannot divide them asunder.
AI summary
Commenting on Revelation 2:12-17
Repent,.... This is said to those who were truly godly in those times, but still retained their communion with these corrupt men, and had not, as yet, separated from then; nor had they protested against these evil doctrines and practices, at least but very coldly, and had too much connived at them; and therefore are called upon to repent of their lukewarmness, negligence, and sinful...
Verse 16. Repent. . Or else I will come unto thee quickly. On the word quickly, . The meaning here is, that he would come against them in judgment, or to punish them. And will fight against them. Against the Nicolaitanes. He would come against the church for tolerating them, but his opposition would be principally directed against the Nicolaitanes themselves.