Jeremiah 17:1

a pen of iron used for making permanent marks on a hard surface, e.g. on rocks (Job 19:24).

diamond as used now by glaziers on account of its extreme hardness. Pliny tells us (Hist. Nat. Jeremiah 37:15) that the ancients were well acquainted with the cutting powers of the diamond, and used to set it in iron. Judah's guilt is, as it were, indelibly engraved upon their utterly hard hearts.

the table of their heart their inward nature. Cp. Proverbs 3:3; Proverbs 7:3.

horns probably metal projections from the corners (Exodus 27:2).

your better read, as in mg. (with LXX) their.