Jeremiah 23:33

And when this people, or the prophet, or a priest, shall ask thee, saying, What [is] the (b) burden of the LORD? thou shalt then say to them, What burden? I will even forsake you, saith the LORD.

(b) The prophets called their threatenings God's burden, which the sinners were not able to sustain, therefore the wicked in deriding the word, would ask of the prophets, what was the burden as though they would say, "You seek nothing else, but to lay burdens on our shoulders" and thus they rejected the word of God as a grievous burden.