'Stylus' in the Bible

“From Ephraim those whose root is in Amalek came down,After you, Benjamin, with your relatives;From Machir came down commanders and rulers,And from Zebulun those who handle the scepter of the [office of] scribe.

The sin of Judah is written down with an iron stylus;With a diamond point it is engraved upon the tablet of their heartAnd on the horns of their altars.