AKA Verbal Inspiration or Complete Inspiration, related to the concept of Scripture as God-Breathed.
Means complete inspiration. Not only the biblical message but also the individual words in which that message was delivered or written down were divinely chosen. This doctrine was stated by Irenaeus in Against All Heresies.
If one accepts "plenary" divine inspiration of Scripture--that is, God's superintendence of the whole--the doctrine of biblical authority doubtless implies "inerrancy" of the content.
(The Origin of the Bible: Newly Updated by Carl F. H. Henry, 2020. Page 20-21.)
Not all Bible authors were prophets in the narrow sense (some were kings, etc), but the inspiration of their writing led to their canonization.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. The Canon of the Old Testament by R. T. Beckwith. Pages 55.)
Opinions
To Irenaeus in Against All Heresies and St. Augustine, inspiration was a high degree of illumination and calm awareness of God's revelation.
Clement of Alexandria, Origen, and Jerome all spoke of inspiration as extending to every word of Scripture.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. The Inerrancy and Infallibility of the Bible by Harold O. J. Brown. Page 38)
Verses
2 Timothy 3:16 - All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness,
Romans 15:4 - For whatever was written in former days was written for our instruction, that through endurance and through the encouragement of the Scriptures we might have hope.
Matthew 5:18 - For truly, I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished.
(https://www.gotquestions.org/verbal-plenary-inspiration.html)