Through the Bible - Inspiration
See 2 Timothy 3:16.
“inspiration of God” (KJV, NKJV) = "breathed out by God" (ESV") = “God-breathed” (ISV, NIV) = "inspired by God" (NLT).
"God's superintendence of the human authors
so that, using their own individual personalities, they composed and recorded without error His revelation to
men in the words of the original autographs”
(Arnold Fruchtenbaum).
The original writings of the authors were guided by the Holy Spirit so the Word of God, as they recorded it, is Divinely inspired and inerrant. There is a fascinating illustration of this in Jeremiah 35.
We only have copies of the original writings. Textual criticism is the attempt to reconstruct, as closely as possible, the original text from the copies we have. The Bible in your hand is NOT, strictly speaking, Divinely inspired - the authors did not write in English! But it most certainly is the written Word of God.