Jeremiah 17:1
This section Jeremiah 17:1-4 is inseparably connected with the preceding. Judah' s sin had been described Jeremiah 16:19 as one of which the very Gentiles will become ashamed. and for which she will shortly be punished by, an intervention of God' s hand more marked than anything in her previous history. Jeremiah now dwells upon the indelible nature of her sin.
A pen of iron - i. e., an iron chisel for cutting inscriptions upon tables of stone.
The point of a diamond - The ancients were well acquainted with the cutting powers of the diamond.
Altars - Not Yahweh' s one altar, but the many altars which the Jews had set up to Baalim Jeremiah 11:13. Though Josiah had purged the land of these, yet in the eleven years of Jehoiakim' s reign they had multiplied again, and were the external proofs of Judah' s idolatry, as the table of her heart was the internal witness.
