Here "dropped like water on them" represents refreshing the people who heard him. The abstract noun "speech" can be translated with the verb "speak" or "say." Alternate translation: "my speech refreshed their hearts as drops of water refresh people's bodies" or "what I said to them refreshed them like drops of water" (See: [[rc://en/ta/man/jit/figs-simile]] and [[rc://en/ta/man/jit/figs-abstractnouns]])