The Question and Answer section for Salome is a great resource to ask questions, find answers, and discuss the novel.
Jokanaan is ordering Salome to get away from him, in the same way that Jesus ordered the devil away after the third temptaton in the desert.
This is from Herod's famous monologue. He claims to have many priceless jewels including a crystal,
"I have a crystal, into which it is not lawful for a woman to look, nor may young men behold it until they have been beaten with rods....
I believe it is from the Biblical story of Salome.