Job 19:24

[That] with a pen of iron and [with] lead they might be engraved on a rock forever!

Jeremiah 17:1

"The sin of Judah [is] written with an iron stylus, with a point of diamond [it is] engraved on the tablet of their heart, and on the horns of their altars.

Exodus 28:11-12

[As the] work of a skilled stone craftsman, [with] seal engravings you will engrave on the two stones the names of the {Israelites}; you will make them mounted [in] gold filigree settings.

Exodus 28:21

The stones will be according to the names of the {Israelites}, twelve according to their names, [with] seal engravings, each according to its name they will be for [the] twelve tribes.

Exodus 32:16

And the tablets, they [were] the work of God; and the writing, it [was] the writing of God engraved on the tablets.

Deuteronomy 27:2-3

And then on the day that you cross the Jordan to the land that Yahweh your God [is] giving to you, then you shall set up {for yourselves} large stones, and you shall paint them with lime,

Deuteronomy 27:8

You shall write on the stone all of the words of this law very clearly."

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
[As the] work of a skilled stone craftsman, [with] seal engravings you will engrave on the two stones the names of the {Israelites}; you will make them mounted [in] gold filigree settings.
Exodus 32:16
And the tablets, they [were] the work of God; and the writing, it [was] the writing of God engraved on the tablets.
Deuteronomy 27:2
And then on the day that you cross the Jordan to the land that Yahweh your God [is] giving to you, then you shall set up {for yourselves} large stones, and you shall paint them with lime,
Jeremiah 17:1
"The sin of Judah [is] written with an iron stylus, with a point of diamond [it is] engraved on the tablet of their heart, and on the horns of their altars.

General references

Deuteronomy 6:9
And you shall write them on the doorframe of your house and on your gates.
Jeremiah 30:2
"Thus says Yahweh, the God of Israel, {saying}, 'Write for yourself all the words that I have spoken to you in a scroll.