Words here are spoken of as if they were something that can be physically placed in a person's mouth. AT: "give him the message that he is to repeat" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The word "mouth" here represents Moses choice of words. AT: "I will give you the right words to speak" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# with his mouth
The word "mouth" here represents Aaron's choice of words. AT: "I will give him the right words to speak" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# He will be your mouth
The word "mouth" here represents Aaron repeating what Moses told him. AT: "He will say what you tell him to say" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# you will be to him like me, God
The word "like" here means Moses would represent the same authority to Aaron as God did to Moses. AT: "you will speak to Aaron with the same authority with which I spoke to you" (See: [[rc://en/ta/man/translate/figs-simile]])