What does 1 Samuel 30:15 mean?

David said, 'Can you lead me to this raiding party?' The man replied, 'Swear to me by God that you won’t kill me or hand me back to my master, and I’ll take you to them.' 1 Samuel 30:15 - Modern Text Bible

(The Egyptian bargains for his life and freedom in exchange for leading David to the Amalekites.)