en_tn/deu/27/10.md

obey the voice of Yahweh your God

Here the metonym "voice of Yahweh" refers to what he says. Alternate translation: "obey what Yahweh your God says" (See: rc://en/ta/man/jit/figs-metonymy)

I am commanding

Moses is commanding. The Levites are there in agreement with Moses, but he is the only one speaking.