Prophet!' said I, `thing of evil! - prophet still, if bird or devil! - Whether tempter sent, or whether tempest tossed thee here ashore, Desolate yet all undaunted, on this desert land enchanted - On this home by horror haunted - tell me truly, I implore - Is there - is there balm in Gilead? - tell me - tell me, I implore!' Quoth the raven, `Nevermore.'
Balm of Gilead is a healing compound (a balm) made from the resinous gum of the North American tree species Populus candicans.
It takes its name from the allusive phrase "balm in Gilead", referring to the balm or balsam carried from Gilead by the caravan of merchants to whom Joseph was sold by his brothers (Genesis chapter 37). _Wikipedia