First let’s establish the fact that Jesus is a lawgiver…
Deut 18:18 I will raise them up a Prophet from among their brethren, like unto thee [Moses], and will put my words in his mouth; and he shall speak unto them all that I shall command him. 19 And it shall come to pass, that whosoever will not hearken unto my words which he will speak in my name, I will require it of him.
So, Jesus is a lawgiver just like Moses was. Moses installed an old covenant with laws, Jesus installed a new covenant with laws.
Break Jesus’ commandments (God’s commandments) and you’ll be least, do and teach Jesus’ commandments, and you’ll be great (Mat 5:19).
Matt 5:38 Ye have heard that it hath been said, an eye for an eye, and a tooth for a tooth; 39 But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Matt 5:43 Ye have heard that it hath been said, Thou shalt love thy neighbor, and hate thy enemy. 44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you; 45 They ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and the unjust.
Then, after concluding his sermon on the mount (which included commandments)…
Matt 7:24 Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock: 25 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell not: for it was founded upon a rock. 26 And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand: 27 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it.
We also have…
Luke 6:27 But I say unto you which hear, Love your enemies, do good to them which hate you, 28 Bless them that curse you, and pray for them which despitefully use you. 29 And unto him that smiteth thee on the one cheek offer also the other; and him that taketh away thy cloke forbid not to take they coat also.
Some would have you believe that there exist obvious exceptions to the commands Jesus issued. But how do you come to that? What standard do you use to decide how far someone’s violence against you warrants you crying “that’s enough of your precious precepts, Jesus!” before throwing a right hook at their jaw?
A servant is not above his master, and Christ’s servants should set him as their example (Luke 6:40, 1 Cor 11:1, 1 Thes 1:6).
And when exactly did Christ reach the point where the injustice done towards him hit that threshold which warrants violent backlash? He never did in his mortal life. And that’s the same pattern for Christians. Christians, let us hold our anger, take no violent reprisal now – but rather make peace and reconcile sinners to God, leaving room for the wrath of God’s ministers in this world and the wrath to come at the end of the age.
Luke 17:33 Whosoever shall seek to save his life shall lose it; and whosoever shall lose his life shall preserve it.
Then, of course, we have the dozens of NT verses which express the pacifist nature of Christianity, as well as the historical witness of the early church and its writers. All these things confirm the doctrine of pacifism and its reception based on the commands of Christ, to which we also must conform our lives if we claim to love him.