General Information:

The summary comes toward the end with an appeal to worship only Yahweh.

with great power and with an outstretched arm

The phrase "raised arm" is metonymy for displaying power and means basically the same thing as "great power." Alternate translation: "with very great power" (See: rc://en/ta/man/jit/figs-metonymy and rc://en/ta/man/jit/figs-doublet)