Jeremiah 17:1

1 The sin of Judah is written with a pen of iron, [and] with the point of a diamond: it is graven upon the tablet of their heart, and upon the horns of your altars;

Jeremiah 17:1 In-Context

1 The sin of Judah is written with a pen of iron, [and] with the point of a diamond: it is graven upon the tablet of their heart, and upon the horns of your altars;
2 whilst their children remember their altars and their Asherim by the green trees upon the high hills.
3 O my mountain in the field, I will give thy substance and all thy treasures for a spoil, [and] thy high places, because of sin, throughout all thy borders.
4 And thou, even of thyself, shalt discontinue from thy heritage that I gave thee; and I will cause thee to serve thine enemies in the land which thou knowest not: for ye have kindled a fire in mine anger which shall burn for ever.
5 Thus saith Jehovah: Cursed is the man that trusteth in man, and maketh flesh his arm, and whose heart departeth from Jehovah.
The American Standard Version is in the public domain.