'Octave' in the Bible

To the Overseer with stringed instruments, on the octave. -- A Psalm of David. O Jehovah, in Thine anger reprove me not, Nor in Thy fury chastise me.

To the Overseer, on the octave. -- A Psalm of David. Save, Jehovah, for the saintly hath failed, For the stedfast have ceased From the sons of men: