The Bible says that believers are to “Be perfect, even as your Father which is in heaven is perfect.” Also to “Be ye holy; for I am holy.”

Mat 5:48 KJV – Be ye therefore perfect, even as your Father which is in heaven is perfect.

Lev 20:7 KJV – Sanctify yourselves therefore, and be ye holy: for I [am] the LORD your God.

1Pe 1:15 KJV – But as he which hath called you is holy, so be ye holy in all manner of conversation;
1Pe 1:16 KJV – Because it is written, Be ye holy; for I am holy.

Does perfection mean never sinning and doing everything right, never making mistakes? Only one ever did everything right, never sinning. That One is Jesus, The Christ, only begotten Son of the Father.

Jesus was able to be perfect because His Father is God, not man. Being God, Jesus was not bound by the power of sin as human beings are. Jesus lived the perfect life for man. He did two things; actually, three. He lived the perfect life in man’s place; He died the sinner’s death in man’s place. The third thing that Jesus did is rise from the dead on the third day, after His execution, to life eternal. This eternal life is given to anyone who chooses to believe in Jesus Christ and follow Him. Believers in Jesus Christ have their sins forgiven.
Jhn 3:16 KJV – For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

Those who believe in Jesus Christ and follow Him strive for perfection. Being human and sinful, it is impossible that sin will not happen. As Paul said:

Rom 7:14 KJV – For we know that the law is spiritual: but I am carnal, sold under sin.
Rom 7:15 KJV – For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.
Rom 7:16 KJV – If then I do that which I would not, I consent unto the law that [it is] good.
Rom 7:17 KJV – Now then it is no more I that do it, but sin that dwelleth in me.
Rom 7:18 KJV – For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but [how] to perform that which is good I find not.
Rom 7:19 KJV – For the good that I would I do not: but the evil which I would not, that I do.
Rom 7:20 KJV – Now if I do that I would not, it is no more I that do it, but sin that dwelleth in me.
Rom 7:21 KJV – I find then a law, that, when I would do good, evil is present with me.
Rom 7:22 KJV – For I delight in the law of God after the inward man:
Rom 7:23 KJV – But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.
Rom 7:24 KJV – O wretched man that I am! who shall deliver me from the body of this death?
Rom 7:25 KJV – I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin.

Rom 8:1 KJV – There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
Rom 8:2 KJV – For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
Believers make mistakes and even willfully disobey God. Because, Jesus has sent the Holy Spirit to live in believers, He lets us know when wrong is being done. When believers realize that sin has been committed, repent and turn away from the sin, God forgives.
(1Jo 1:9 KJV – If we confess our sins, he is faithful and just to forgive us [our] sins, and to cleanse us from all unrighteousness.)
Even though believers still sin, they don’t want to. When they realize that they have sinned, by the prompting of the Holy Spirit that is in them, and they humbly confess their sin, turning away from it, God forgives their sin because of Jesus Christ, His Son.
Rom 8:1 KJV – [There is] therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
Living a perfect life is not living a life that is perfect. Instead, the perfect life is a series of failures followed by successes.
Pro 24:16a KJV – For a just [man] falleth seven times, and riseth up again:
God knows that man is not perfect, nor can be. That is why Jesus did for man what man cannot do for himself.

Jhn 3:14 KJV – And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up:
Jhn 3:15 KJV – That whosoever believeth in him should not perish, but have eternal life.
Jhn 3:16 KJV – For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
Jhn 3:17 KJV – For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
Jhn 3:18 KJV – He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
Jhn 3:19 KJV – And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
Jhn 3:20 KJV – For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.
Jhn 3:21 KJV – But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.
Believers are commanded to strive for perfection. God wants believers to live life with passion and energy, learning as they go. The perfect life is not a sinless life; it is a life lived fully, honoring God in Jesus Christ, led by the Holy Spirit; confessing and asking forgiveness for sins committed intentionally and unintentionally then moving forward in faith.
Jhn 10:10b KJV – I am come that they might have life, and that they might have [it] more abundantly.
When failure happens, as it does to everyone, Jesus is there to lift up the believer and set him right again. He will be there to lift up the believer every time they fall.
See how much God loves us. He has sent Jesus to rescue us, and the Holy Spirit to guide us.
Hbr 2:3a KJV – How shall we escape, if we neglect so great salvation;