Jeremiah 17:1

The people had asked (Jer 16:10), What is our iniquity, and what is our sin? as if they could not be charged with any thing worth speaking of, for which God should enter into judgment with them; their challenge was answered there, but here we have a further reply to it, in which, I. The indictment is fully proved upon the prisoners, both the fact and the fault; their sin is too plain to be denied and too bad to be excused, and they have nothing to plead either in extenuation of the crime or in arrest and mitigation of the judgment. 1. They cannot plead, Not guilty, for their sins are upon record in the book of God's omniscience and their own conscience; nay, and they are obvious to the eye and observation of the world, Jer 17:1, Jer 17:2. They are written before God in the most legible and indelible characters, and sealed among his treasures, never to be forgotten, Deu 32:34. They are written there with a pen of iron and with the point of a diamond; what is so written will not be worn out by time, but is, as Job speaks, graven in the rock for ever. Note, The sin of sinners is never forgotten till it is forgiven. It is ever before God, till by repentance it comes to be ever before us.

— Matthew Henry's Concise Commentary (public domain)