Daniel 4:1 (ESV)

1 King Nebuchadnezzar to all peoples, nations, and languages, that dwell in all the earth: Peace be multiplied to you!

Nebuchadnezzar himself becomes a Bible writer in this chapter. The Holy Spirit records an order and an account written by the king of Babylon himself. For example, look at Daniel 4:4 and Daniel 4:34: I, Nebuchadnezzar, was at ease in my house and prospering in my palace...At the end of the days, I, Nebuchadnezzar, lifted my eyes to heaven, and my reason returned to me, and I blessed the Most High, and praised and honored him who lives forever, for his dominion is an everlasting dominion, and his kingdom endures from generation to generation.