GOD'S 10 COMMANDMENTS ARE ALL MORAL LAWS ACCORDING TO SCRIPTURE.
All of God's 10 commandments including God's 4th commandment Sabbath are moral laws and our duty of love to God and our fellow man.
Let's look at what the scriptures teach on this subject further....
PSALMS 119:172 [172] My tongue shall speak of your word: for ALL YOUR COMMANDMENTS ARE RIGHTOUESNESS.< tsedeq RIGHT DOING - MORAL>
Hebrew and Greek Dictionaries w/TVM, Strong -
Righteousness H6664; צדק tsedeq; tseh'-dek; From H6663; the right, natural, MORAL or legal); also (abstractly) equity or (figuratively) prosperity: - X even, (X that which is altogether) just (-ice), ([un-]) right (-eous) (cause, -ly, -ness).
RIGHTEOUSNESS is defined as the standard of MORAL RIGHT in the Hebrew which God’s Word defines as ALL GOD’S COMMANDMENTS. This of course includes God’s 4th commandment which is one of God’s 10 commandments written with the finger of God.
The opposite of righteousness is unrighteousness as shown in this scripture here…
1 JOHN 5:17-18 [17] ALL UNRIGHTEOUSNESS IS SIN: and there is a sin not to death.
[18], WE KNOW THAT WHOEVER IS BORN OF GOD SINS NOT; but he that is begotten of God keeps himself, and that wicked one touches him not.
UNRIGHTEOUSNESS in HEBREW (H5766) עול עול עולה עולה עלה ;‛evel ‛âvel ‛avlâh ‛ôlâh ‛ôlâh From H5765; MORAL EVIL: - iniquity, perverseness, unjust (-ly), unrighteousness (-ly), wicked (-ness).
UNRIGHTEOUSNESS in GREEK (G93) ἀδικία; adikia (legal) injustice (properly the quality, by implication the act); MORAL WRONGFULNESS of charater, life or act: - iniquity, unjust, unrighteousness, wrong.
ALL UNRIGHTEOUSNESS (ἀδικία Moral wrongfulness) IS SIN which is breaking any one of God's 10 commandments. UNRIGHTEOUSNESS is the opposite of RIGHTEOUSNESS and ALL UNRIGHTEOUSNESS is SIN *1 JOHN 5:17 and SIN is breaking any one of God's 10 commandments *JAMES 2:10-11; 1 JOHN 3:4 then RIGHTEOUSNESS is OBEDIENCE to God's ETERNAL LAW (10 commandments) as is why it is written;
PSALMS 119:172 [172] My tongue shall speak of your word: for ALL YOUR COMMANDMENTS ARE *RIGHTEOUSNESS.<Moral Right Doing>
ROMANS 3:12 They are all gone out of the way, they are together become unprofitable; there is none that does GOOD (good G5544) no, not one.
Hebrew and Greek Dictionaries w/TVM, Strong - G5544
χρηστότης; chrēstotēs From G5543; usefulness, that is, MORAL EXCELLENCE in character or demeanor: - gentleness, good (-ness), kindness.
1 CORINTHIANS 15:33 Be not deceived: Evil companionship corrupt GOOD MORALS (G2239)
Hebrew and Greek Dictionaries w/TVM, Strong - G2239
ἦθος; ēthos A strengthened form of G1485; usage, that is, (plural) MORAL HABITS: - manners
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Christian bible dictionary definitions agree with the Hebrew and Greek scriptures shown above...
Webster's Unabridged Dictionary, 1828
MOR'AL, a. [L. moralis, from mos, moris, manner.]
1. Relating to the practice, manners or conduct of men as social beings in relation to each other, and with reference to right and wrong. The word moral is applicable to actions that are good or evil, virtuous or vicious, and has reference to the law of God as the standard by which their character is to be determined. The word however may be applied to actions which affect only, or primarily and principally, a person's own happiness. Keep at the least within the compass of moral actions, which have in them vice or virtue. Mankind is broken loose from moral bands.
2. Subject to the moral law and capable of moral actions; bound to perform social duties; as a moral agent or being.
3. Supported by the evidence of reason or probability; founded on experience of the ordinary course of things; as moral certainty, distinguished from physical or mathematical certainty or demonstration.
Physical and mathematical certainty may be stiled infallible, and moral certainty may be properly stiled indubitable.
Things of a moral nature may be proved by moral arguments.
4. Conformed to rules of right, or to the divine law respecting social duties; virtuous; just; as when we say, a particular action is not moral.
5. Conformed to law and right in exterior deportment; as, he leads a good moral life.
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As shown above through the scriptures RIGHTEOUSNESS means MORAL RIGHT DOING linked to action. "All of God's commandments are righteousness" *Psalms 119:172
MORE BIBLICAL SUPPORT FOR MORAL LAWS (duty of love towards God and man)
God’s law written and spoken by God on two tables of stone (Exodus 32:16; Exodus 20:1) Exodus 20:3; Exodus 20:4-6; Exodus 20:7; Exodus 20:8-11; Exodus 20:12; Exodus 20:13; Exodus 20:14; Exodus 20:15; Exodus 20:16; Exodus 20:17. Moral laws written and spoken by Moses in the book of the law or covenant (Exodus 24:7; Deuteronomy 30:19) Leviticus 19:32; Deuteronomy 10:20; Leviticus 19:16-18; Leviticus 19:1-37 (most of which are expounding on God’s 10 commandments; Exodus 23:5; Deuteronomy 22:4; Exodus 22:21; Deuteronomy 24:19-21; Deuteronomy 15:7-11; Deuteronomy 10:19; Exodus 22:20; Exodus 21:15-17; Deuteronomy 23:18; Exodus 21:10; Deuteronomy 22:19; Leviticus 18:1-30; Exodus 23:1-12; Leviticus 25:14; 37; Matthew 22:36-40; Romans 13:8-10; James 2:8-12 etc etc…
Yep if you love your neighbor you will not lie, steal or kill them (moral right doing - Psalms 119:172). If you love God you will not have or make other Gods and bow down to them, use God's name in vain or break His Sabbath (Exodus 20:1-17; moral right doing - Psalms 119:172).
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CONCLUSION: According to God's Word as shown in the scriptures above all of God's commandments including God's 4th commandment are MORAL LAWS (righteousness; moral right doing).
Blessings.