Job 19:24

That with an iron style and lead they were graven in the rock for ever!

Jeremiah 17:1

The sin of Judah is written with a style of iron, with the point of a diamond, engraven upon the tablet of their heart, and upon the horns of your altars;

Exodus 28:11-12

According to the work of an engraver in stone, as the engravings of a seal, shalt thou engrave the two stones with the names of the sons of Israel; surrounded by enclosures of gold shalt thou make them.

Exodus 28:21

And the stones shall be according to the names of the children of Israel, twelve, according to their names, engraved as a seal: every one according to his name shall they be for the twelve tribes.

Exodus 32:16

And the tables were God's work, and the writing was God's writing, engraven on the tables.

Deuteronomy 27:2-3

And it shall be on the day when ye pass over the Jordan unto the land which Jehovah thy God giveth thee, that thou shalt set thee up great stones, and plaster them with plaster:

Deuteronomy 27:8

And thou shalt write upon the stones all the words of this law very plainly.

Treasury of Scripture Knowledge

Summary

That they were graven with an iron pen and lead in the rock for ever!

General references

Bible References

Graven

Exodus 28:11
According to the work of an engraver in stone, as the engravings of a seal, shalt thou engrave the two stones with the names of the sons of Israel; surrounded by enclosures of gold shalt thou make them.
Exodus 32:16
And the tables were God's work, and the writing was God's writing, engraven on the tables.
Deuteronomy 27:2
And it shall be on the day when ye pass over the Jordan unto the land which Jehovah thy God giveth thee, that thou shalt set thee up great stones, and plaster them with plaster:
Jeremiah 17:1
The sin of Judah is written with a style of iron, with the point of a diamond, engraven upon the tablet of their heart, and upon the horns of your altars;

General references

Deuteronomy 6:9
And thou shalt write them upon the posts of thy house, and upon thy gates.
Jeremiah 30:2
Thus speaketh Jehovah the God of Israel, saying, Write thee in a book all the words that I have spoken unto thee.