Job 19:24

They shall be cut in the rock with a style of iron and lead, forever.

Jeremiah 17:1

The sin of Judah was written with a style of iron, with the nail of diamond: being graved upon the table of their heart, and to the horns of your altars.

Exodus 28:11-12

The work of a stone engraver, the engravings of a signet, engrave the two stones with the names of the sons of Israel: surrounded with textures of gold thou shalt make them.

Exodus 28:21

And the stones shall be over the names of the sons of Israel, twelve, according to their names, the engravings of a signet; each according to his name shall be the twelve tribea

Exodus 32:16

And the tables they the work of God, and the writing the writing of God, it being cut in the tables.

Deuteronomy 27:2-3

And it was in the day which ye shall pass over Jordan to the land that Jehovah thy God gave to thee, and set up to thee great stones, and plaster them with lime.

Deuteronomy 27:8

And write upon the stones all the words of this law very diligently.

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
The work of a stone engraver, the engravings of a signet, engrave the two stones with the names of the sons of Israel: surrounded with textures of gold thou shalt make them.
Exodus 32:16
And the tables they the work of God, and the writing the writing of God, it being cut in the tables.
Deuteronomy 27:2
And it was in the day which ye shall pass over Jordan to the land that Jehovah thy God gave to thee, and set up to thee great stones, and plaster them with lime.
Jeremiah 17:1
The sin of Judah was written with a style of iron, with the nail of diamond: being graved upon the table of their heart, and to the horns of your altars.

General references

Deuteronomy 6:9
And write them upon the door posts of thine house, and upon thy gates.
Jeremiah 30:2
Thus said Jehovah God of Israel, saying, Write for thee all the words which I spake to thee upon the writing.