# Then they will hear
Possible meanings are 1) the two witnesses will hear or 2) the people will hear what is said to the two witnesses.
# a loud voice from heaven
The word "voice" refers to the one who speaks. Alternate translation: "someone speak loudly to them from heaven and" (See: [[rc://en/ta/man/jit/figs-metonymy]])
# say to them
"say to the two witnesses"