King David's Nevel Harp with Case. biblical Nevel harp, 26", 15 nylon strings for the biblical scale. Mentioned in Psalms the Nevel is a stringed instrument as shown known from King David played to temper the ravings of King Saul. The bass vibrations are said to bring peace to the soul. The instrument is also associated with the Coptic Church since the 4th century, was played primarily at Christmas and Lent.