Jeremiah 26:18
Micah the Morasthite prophesied in the days of Hezekiah king of Judah, and spake to all the people of Judah, saying, Thus saith the LORD of hosts; Zion shall be plowed like a field, and Jerusalem shall become heaps, and the mountain of the house as the high places of a forest.
Micah 1:1-2
The word of the LORD that came to Micah the Morasthite in the days of Jotham, Ahaz, and Hezekiah, kings of Judah, which he saw concerning Samaria and Jerusalem.
Hear, all ye people; hearken, O earth, and all that therein is: and let the Lord GOD be witness against you, the Lord from his holy temple.
Isaiah 1:1
The vision of Isaiah the son of Amoz, which he saw concerning Judah and Jerusalem in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah.
Hear, O heavens, and give ear, O earth: for the LORD hath spoken, I have nourished and brought up children, and they have rebelled against me.
Hosea 1:1
The word of the LORD that came unto Hosea, the son of Beeri, in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah, and in the days of Jeroboam the son of Joash, king of Israel.
Its seem evident that Micah, Isaiah and Hosea are the same prophet under different names, who all were simultaneously the prophet that served Hezekiah.
1. Jeremiah only mentions Micah
2. Micah, Isaiah and Hosea have the same opening
3. Micah, Isaiah and Hosea do not mention each other
In fact Isaiah 2:2-4 and Micah 4:1-3 are the same.
Isaiah 2:2-4
And it shall come to pass in the last days, that the mountain of the LORD'S house shall be established in the top of the mountains, and shall be exalted above the hills; and all nations shall flow unto it.
And many people shall go and say, Come ye, and let us go up to the mountain of the LORD, to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for out of Zion shall go forth the law, and the word of the LORD from Jerusalem.
And he shall judge among the nations, and shall rebuke many people: and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up sword against nation, neither shall they learn war any more.
Micah 4:1-3
But in the last days it shall come to pass, that the mountain of the house of the LORD shall be established in the top of the mountains, and it shall be exalted above the hills; and people shall flow unto it.
And many nations shall come, and say, Come, and let us go up to the mountain of the LORD, and to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for the law shall go forth of Zion, and the word of the LORD from Jerusalem.
And he shall judge among many people, and rebuke strong nations afar off; and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up a sword against nation, neither shall they learn war any more.
Isaiah 36–39 is the same as 2 Kings 18–20, so perhaps Isaiah 1-35 are part of some original.