This does not answer the question. What law is spiritual? The 10 commandments? No... Again before ANYTHING was made, there was God. "Thou shalt not kill" could not have been spiritual as there is no one to kill. It thus goes to show that there was another law that is deemed spiritual. We know these things to stem from its source, love. Upon which there is no such law ("thou shalt not").
Really?
Mat 5:21 Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
Mat 5:22 But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.
Mat 5:23 Therefore if thou bring thy gift to the altar, and there rememberest that thy brother hath ought against thee;
Mat 5:24 Leave there thy gift before the altar, and go thy way; first be reconciled to thy brother, and then come and offer thy gift.
Mat 5:25 Agree with thine adversary quickly, whiles thou art in the way with him; lest at any time the adversary deliver thee to the judge, and the judge deliver thee to the officer, and thou be cast into prison.
Mat 5:26 Verily I say unto thee, Thou shalt by no means come out thence, till thou hast paid the uttermost farthing.
Here Christ shows us that harboring ill will in one's heart toward another is to break the sixth Commandment. The Law has always been Spiritual (Rom 7:14). It has always been sin to hate, harbor ill will or think evil thoughts toward another...
Lev 19:17 Thou shalt not hate thy brother in thine heart: thou shalt in any wise rebuke thy neighbour, and not suffer sin upon him.
Lev 19:18 Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the LORD.
So how does this stack up against the sixth Commandment...
Isa 14:12 How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!
Isa 14:13 For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north:
Isa 14:14 I will ascend above the heights of the clouds; I will be like the most High.
Eze 28:14 Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire.
Eze 28:15 Thou wast perfect in thy ways from the day that thou wast created,
till iniquity was found in thee.
Eze 28:16
By the multitude of thy merchandise they have filled the midst of thee with violence, and thou hast sinned: therefore I will cast thee as profane out of the mountain of God: and I will destroy thee, O covering cherub, from the midst of the stones of fire.
Eze 28:17 Thine heart was lifted up because of thy beauty, thou hast corrupted thy wisdom by reason of thy brightness: I will cast thee to the ground, I will lay thee before kings, that they may behold thee.
Here is Lucifer sinning against God and being cast out of heaven. Along with this cam a name change from Light Bringer to Adversary.