The word "it" refers to "the righteousness" of [Romans 10:6](./06.md). Here Paul describes "righteousness" as a person who can speak. Paul uses a question to emphasize the answer he is about to give. Alternate translation: "But this is what Moses says" (See: [[rc://en/ta/man/translate/figs-personification]] and [[rc://en/ta/man/translate/figs-rquestion]])
Paul speaks of God's message as if it were a person who can move. Alternate translation: "You have heard the message" (See: [[rc://en/ta/man/translate/figs-personification]])
The word "mouth" is a metonym that refers to what a person says. Alternate translation: "You know how to speak ... God's message" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The phrase "in your heart" is metonym that refers to what a person thinks and believes. Alternate translation: "You know what ... God's message means" (See: [[rc://en/ta/man/translate/figs-metonymy]])