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Well, the concrete part I know is it’s part of OT prophecy of the coming of Christ and the establishment of his kingdom; he reigns today at the right hand of God.

Matthew 4:17 From that time Jesus began to preach, and to say, Repent: for the kingdom of heaven is at hand.

One OT prophetic verse:

Jeremiah 31:33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the Lord, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.

And this is of course confirmed in the NT.

2 Corinthians 3:3 Forasmuch as ye are manifestly declared to be the epistle of Christ ministered by us, written not with ink, but with the Spirit of the living God; not in tables of stone, but in fleshy tables of the heart.

Further explained:

Romans 2

“13 (For not the hearers of the law are just before God, but the doers of the law shall be justified.
14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:
15 Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)”

There are more verses in both OT and NT, of course, that I don’t have time to list.

The Law in the OT was given to the Israelites, even though it applies universally, of course. They were God’s chosen people. But by _faith_, which is where many misunderstood. One could convert to Judaism or marry in.

The nation of Israel is thus an archetype of the Church, as God’s chosen people; all who are saved by Grace through Faith in Christ. We are likened to “adopted” children of God as opposed to children by blood. Instead of God’s law being given to us in tablets of stone, it is written on the hearts of believers.

Hebrews 8

“6 But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
7 For if that first covenant had been faultless, then should no place have been sought for the second.
8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
9 Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord.
10 For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
11 And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.
12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
13 In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.”

Which is referenced in the OT in the Psalms, so obviously the preferred, better arrangement is to take God’s Law to heart, not just intellectually know it - even in the OT.

Psalm 40

“1 I waited patiently for the Lord; and he inclined unto me, and heard my cry.
2 He brought me up also out of an horrible pit, out of the miry clay, and set my feet upon a rock, and established my goings.
3 And he hath put a new song in my mouth, even praise unto our God: many shall see it, and fear, and shall trust in the Lord.
4 Blessed is that man that maketh the Lord his trust, and respecteth not the proud, nor such as turn aside to lies.
5 Many, O Lord my God, are thy wonderful works which thou hast done, and thy thoughts which are to us-ward: they cannot be reckoned up in order unto thee: if I would declare and speak of them, they are more than can be numbered.
6 Sacrifice and offering thou didst not desire; mine ears hast thou opened: burnt offering and sin offering hast thou not required.
7 Then said I, Lo, I come: in the volume of the book it is written of me,
8 I delight to do thy will, O my God: yea, thy law is within my heart.”

But notice it does not say written. All I found is references meaning “take it to heart”, etc., not that the law was written by God on hearts in the OT.

Except for this one, where Jeremiah prophecies about Israel’s coming enslavement:

Jeremiah 17:1 The sin of Judah is written with a pen of iron, and with the point of a diamond: it is graven upon the table of their heart, and upon the horns of your altars;

There are more verses, of course, that was just a quick search.