…ye shall therefore be holy, for I am holy. – Leviticus 11:45 (see also 1Peter 1:16)

The first thing that every Christian has to see to is holiness. I will not try at any great length to explain what that word means, but it always sounds to me as if it explained itself. You know what wholeness is-a thing, without a crack, or flaw, or break; complete, entire, uninjured, whole. Well, that is the main meaning of holy. The character of God is perfectly holy; in it nothing is lacking; nothing is redundant. When a thing, is complete it is whole, and this applied to moral and spiritual things gives you the inner meaning of “holy.” When a man is healthy, perfectly healthy, in spirit, soul, and body, then he is perfectly holy; for sin is a moral disorder, and righteousness is the right state of every faculty. The man whose spiritual health is altogether right is right towards God, right towards himself, right towards men, right towards time, right towards eternity. He is right towards the first table of the law, and right towards the second table. He is an all-round man; he is a whole man, a holy man. Truth is within him; truth is spoken by him; truth is acted by him. Righteousness is in him; he thinks the right thing, and chooses that which is according to the law of uprightness. There is justice in him; he abhors that which is evil. There is goodness in him; he follows after that which will benefit his fellow-men. I cannot spare time to tell you all that the word “holy” means; but if you wish to see holiness, look at Christ. In Him you see a perfect character, an all-round character. He is the perfect One; be ye like Him in all holiness.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1732.cfm