'Eight stringed' in the Bible

and Mattithiah, and Eliphelehu, and Mikneiah, and Obed-Edom, and Jeiel, and Azaziah, with harps tuned to the eight-stringed lyre, to lead.

For you will bless the righteous. Yahweh, you will surround him with favor as with a shield. For the Chief Musician; on stringed instruments, upon the eight-stringed lyre. A Psalm by David.

For Yahweh is righteous. He loves righteousness. The upright shall see his face. For the Chief Musician; upon an eight-stringed lyre. A Psalm of David.