Here "his strong hand upon me" is an idiom that refers to Yahweh's power. Alternate translation: "Yahweh spoke to me in a very powerful way" (See: [[rc://en/ta/man/translate/figs-idiom]])
This is an indirect quote that ends in 8:17. Alternate translation: "warned me and said, 'Do not act like this people.'" (See: [[rc://en/ta/man/translate/figs-quotations]])