Moses continues speaking to the people of Israel as if they were one man, so all instances of "you" are singular. (See: [[rc://en/ta/man/translate/figs-you]])
Here "voice" is a metonym for what a person says or a synecdoche for the whole person. AT: "he will not do what we tell him to do" or "he will not obey us" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-synecdoche]])
The adjective "evil" can be translated as a noun phrase. AT: "you must remove from among the Israelites the person who does this evil thing" or "you must execute this evil person" (See: [[rc://en/ta/man/translate/figs-nominaladj]])
The full meaning of this statement can be made explicit. AT: "will hear about what happened to the son and be afraid that the people will punish them also" (See: [[rc://en/ta/man/translate/figs-explicit]])