The sin of Judah [is] written with a pen of iron, [and] with the point of a diamond: [it is] graven upon the table of their heart, and upon the horns of your altars;
Berean Study Bible (BSB) - Jeremiah 17:1 >“The sin of Judah is written with an iron stylus, engraved with a diamond point on the tablets of their hearts and on the horns of their altars.