Verses with the word strings in the Old Testament (4 verses):

Psalms 21:12
Therefore shalt thou make them turn their back, when thou shalt make ready thine arrows upon thy strings against the face of them.

Psalms 33:2
Praise the LORD with harp: sing unto him with the psaltery and an instrument of ten strings.

Psalms 92:3
Upon an instrument of ten strings, and upon the psaltery; upon the harp with a solemn sound.

Psalms 144:9
I will sing a new song unto thee, O God: upon a psaltery and an instrument of ten strings will I sing praises unto thee.