What is the burden of the Lord? - The word משא massa, here used, signifies burden, oracle, prophetic discourse; and is used by almost every prophet. But the persons in the text appear to have been mockers. “Where is this burden of the Lord?” - “What is the burden now?” To this insolent question the prophet answers in the following verses.
I will ever forsake you - I will punish the prophet, the priest and the people, that speak thus, Jer 23:34. Here are burdens.