2 Timothy 3:16 All scripture is God breathed and is useful for teaching, rebuking,correcting and training in rightousness, so that the man of God may be thouroghly equipped for every good work.

God breath signifies that all of the writters were carried by God sort of like the wind carries a sail,.

Jesus described the scriptures as the very word that comes out of the mouth of God. Matt 4:4 7,10.

Also scripture claims " thus says the Lord" Isa 1:11

Also in Matt 15:6 Jesus told the Jews " Thus you nullify the word of God for the sake of your traditions>

Rom 3:2 Paul speaks of the scriptures as the " oracles of God"

Heb 4:12 says that word of God is sharper than a double edge sword.