Night shall be unto you, that ye shall not have a vision. The Hebrew is, "from," or "without a vision." Septuagint, ἐξ ὁράσεως, "out of vision;" Vulgate, pro visione. Hence some interpret this as spoken to the false prophets, who, to punish their lying prophecies and pretended revelations, shall be overwhelmed with calamity.
But it is best taken as still addressed to the rulers, and Micah tells how that in the time of their distress there shall be no prophecy to direct them. "Night shall be unto them without a vision." "Night" and "darkness" are metaphors for calamity, as in all languages.
That ye shall not divine; without divination. Septuagint, ἐκ μαντείας, "out of prophecy." Parallel and identical in meaning with the preceding clause. The sun shall go down over the prophets; i.e. over the false prophets.
The sun of their prosperity shall set. Micah seems to derive his imagery from the phenomena of an eclipse (comp. Jeremiah 15:9; Amos 8:9). The day. The time of their punishment (Micah 2:4; Amos 5:18).