2 and if you swear, "As the Lord lives!" in truth, in justice, and in uprightness, then nations shall be blessed by him, and by him they shall boast.

Matthew Henry's Commentary on Jeremiah 4:2

Commentary on Jeremiah 4:1-2

(Read Jeremiah 4:1-2)

The first two verses should be read with the last chapter. Sin must be put away out of the heart, else it is not put away out of God's sight, for the heart is open before him.