Here "hand of Moses" refers to the scriptures that Moses wrote down. AT: "through the things that Moses wrote" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here the shed blood of a person represents their death. This can be stated in active form. AT: "avenge a person's death" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-activepassive]])