How do ye say...? — The question is put to priests and prophets, who were the recognised expounders of the Law, but not to them only. The order of scribes, which became so dominant during the exile, was already rising into notice. Shaphan, to whom Hilkiah gave the re-found Book of the Law, belonged to it (2 Chronicles 34:15), and the discovery of that book would naturally give a fresh impetus to their work. They were boasting of their position as the recognised instructors of the people.
Lo, certainly... — Better, Verily, lo! the lying pen of the scribes hath made it (i.e., the Law) as a lie. The pen was the iron stylus made for engraving on stone or metal. The meaning of the clause is clear. The sophistry of men was turning the truth of God into a lie, and emptying it of its noblest meaning. Already, as in other things, so here, in his protest against the teaching of the scribes, with their traditional and misleading casuistry, Jeremiah appears as foreshadowing the prophet of Nazareth (Matthew 5:20-48; Matthew 23:2-26).