Exod 31:18

“This law was "written with the finger of God," and this finger of God the New Testament explicitly identifies with the Holy Spirit. For when one Evangelist has "By the finger of God, I cast out devils," another says this same thing thus: "By the spirit of God, I cast out devils." Who would not have this joy in the divine mysteries, when the redemptive doctrine shines with so clear a light, rather than all the powers of this world though they be infused with unwonted peace and happiness?”

“Let us look at the Decalogue itself. Undoubtedly Moses received on the mount a law to be ministered to the people, written on tables of stone by the finger of God. It is comprised in ten commandments, among which there is no charge of circumcision or of the animal sacrifices which by Christians are no longer offered. In these ten commandments, apart from the observance of the sabbath, I would ask what the Christian is not bound to observe. Of the commands, not to make or worship idols or any other gods but the one true God, not to take God's name in vain, to honor parents, to avoid fornication, murder, theft, false witness, adultery, and the coveting of that which is another's—which among these commands can be said not to bind the Christian? What the apostle calls "the letter that kills" is not this law, written on the two tables, but that of circumcision and the other ancient ordinances now done away. For in the law of the tables comes "You shall not covet," the command by which (says Paul), "though it is holy and righteous and good, sin deceived me and thereby slew me"8—which can only be "the letter killing."”

“Since the rules pertaining to the necessity of justice are contained in the divine precepts, and it belongs to justice to "render to each one his due": it is necessary that certain moral precepts order us toward God: and certain toward our neighbor according to the twofold precept of charity; which the Holy Spirit willed to intimate through the mystery of the two tablets, and therefore they are said to be written by the finger of God.”

“Testimony, to inform men of their duty. — Written, not by Moses, or by any man, but by God himself, or by an angel. (Chap. xxxiv. 1.; Galatians iii. 19.) (Calmet) Bible Text & Cross-references: Beseleel and Ooliab are appointed by the Lord to make the tabernacle, and the things belonging thereto. The observation of the sabbath day is again commanded. And the Lord delivereth to Moses two tables written with the finger of God. 1 And the Lord spoke to Moses, saying: 2 Behold, I have called by name Beseleel the son of Uri, the son of Hur, of the tribe of Juda, 3 And I have filled him with the spirit of God, with wisdom and understanding, and knowledge in all manner of work, 4 To devise whatsoever may be artificially made of gold, and silver, and brass, 5 Of marble, and precious stones, and variety of wood. 6 And I have given him for his companion Ooliab, the son of Achisamech, of the tribe of Dan. And I have put wisdom in the heart of every skilful man, that they may make all things which I have commanded thee, 7 The tabernacle of the covenant, and the ark of the testimony, and the propitiatory that is over it, and all the vessels of the tabernacle, 8 And the table and the vessels thereof, the most pure candlestick with the vessels thereof, and the altars of incense, 9 And of holocaust, and all their vessels, the laver with its foot, 10 The holy vestments in the ministry for Aaron the priest, and for his sons, that they may execute their office, about the sacred things: 11 The oil of unction, and the incense of spices in the sanctuary, all things which I have commanded thee, shall they make. 12 And the Lord spoke to Moses, saying: 13 Speak to the children of Israel, and thou shalt say to them: *See that you keep my sabbath; because it is a sign between me and you in your generations: that you may know that I am the Lord, who sanctify you. 14 Keep you my sabbath: for it is holy unto you: he that shall profane it, shall be put to death: he that shall do any work in it, his soul shall perish out of the midst of his people. 15 Six days shall you do work: in the seventh day is the sabbath, the rest holy to the Lord. Every one that shall do any work on this day, shall die. 16 Let the children of Israel keep the sabbath, and celebrate it in their generations. It is an everlasting covenant 17 Between me and the children of Israel, and a perpetual sign. *For in six days the Lord made heaven and earth, and in the seventh he ceased from work. 18 And the Lord, when he had ended these words in Mount Sinai, *gave to Moses two stone tables of testimony, written with the finger of God.”

“When Moses had received all the instructions respecting the sanctuary to be erected, Jehovah gave him the two tables of testimony-tables of stone, upon which the decalogue was written with the finger of God. It was to receive these tables that he had been called up the mountain (Exo 24:12). According to Exo 32:16, the tables themselves, as well as the writing, were the work of God; and the writing was engraved upon them (חרוּת from חרת = χαράττειν), and the tables were written on both their sides (Exo 32:15). Both the choice of stone as the material for the tables, and the fact that the writing was engraved, were intended to indicate the imperishable duration of these words of God. The divine origin of the tables, as well as of the writing, corresponded to the direct proclamation of the ten words to the people from the summit of the mountain by the mouth of God. As this divine promulgation was a sufficient proof that they were the immediate word of God, unchanged by the mouth and speech of man, so the writing of God was intended to secure their preservation in Israel as a holy and inviolable thing. The writing itself was not a greater miracle than others, by which God has proved Himself to be the Lord of nature, to whom all things that He has created are subservient for the establishment and completion of His kingdom upon earth; and it can easily be conceived of without the anthropomorphic supposition of a material finger being possessed by God. Nothing is said about the dimensions of the tables: at the same time, we can hardly imagine them to have been as large as the inside of the ark; for stone slab 2 1/2 cubits long and 1 1/2 cubits broad, which must necessarily have been some inches in thickness to prevent their breaking in the hand, would have required the strength of Samson to enable Moses to carry them down the mountain "in his hand" (Exo 32:15), or even "in his two hands" (Deu 9:15, Deu 9:17). But if we suppose them to have been smaller than this, say at the most a cubit and a half long and one cubit broad, there would have been plenty of room on the four sides for the 172 words contained in the decalogue, with its threats and promises (Ex 20:2-17), without the writing being excessively small.”