en_tn/deu/30/13.md

Who will go over the sea for us and bring it to us and make us to hear it, so that we may do it?

AT: “Someone must travel across the sea to learn God's commands and then return and tell us what they are” (See: rc://en/ta/man/translate/figs-rquestion)

in your mouth and your heart

These words mean basically the same thing. They emphasize that the people already know God's commands and can speak them. (See: rc://en/ta/man/translate/figs-doublet and rc://en/ta/man/translate/figs-metonymy)