Here "mouth" represents what Yahweh says. AT: "you will hear the message that I speak and you will warn them on my behalf" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here "blood" represents a person's death. The phrase "require ... from your hand" is an idiom that means to consider someone responsible. AT: "I will consider you responsible for his death" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-idiom]])
A person no longer behaving in a certain way is spoken of as if he physically turns and goes back on a path. AT: "he might stop doing bad things, and if he does not stop doing bad things" (See: [[rc://en/ta/man/translate/figs-metaphor]])