Yahweh uses questions to emphasize that he was the one who told them these things would happen. Alternate translation: "I will tell you who has shown this from long ago. I will tell you who announced it. It was I, Yahweh." (See: [[rc://en/ta/man/jit/figs-rquestion]])
These double negatives emphasize that the speaker is the only God. Alternate translation: "I am the only God ... I am the only one" (See: [[rc://en/ta/man/jit/figs-doublenegatives]])