Boyd’s Bible Dictionary:

(cane, rule). Word first applied to the Scriptures by Amphilochius about A. D. 380 (Gal. 6:1616And as many as walk according to this rule, peace be on them, and mercy, and upon the Israel of God. (Galatians 6:16); Phil. 3:1616Nevertheless, whereto we have already attained, let us walk by the same rule, let us mind the same thing. (Philippians 3:16)). O. T. canon fixed by the Jews, and accepted by Christ and his times. N. T. canon ratified by third council of Carthage, A. D. 397.