This means he prophesied toward the altar in a loud and condemning voice. Alternate translation: "prophesied loudly toward the altar" (See: [[rc://en/ta/man/translate/figs-idiom]])
The prophet spoke to the altar as if it were a person who could hear him. He said this twice for emphasis. (See: [[rc://en/ta/man/translate/figs-apostrophe]] and [[rc://en/ta/man/translate/figs-personification]])
# a son named Josiah will be born to the family of David
Here the "family of David" refers to the descendants of David. This can be stated in active form. Alternate translation: "a descendant of David will have a son named Josiah" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-activepassive]])