Here "heart" and "soul" are metonyms for a person's inner being. These two phrases are used together to mean "completely" or "earnestly." See how you translated this in [Deuteronomy 4:29](../04/29.md). (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-doublet]])
The words "walk," "keep," and "listen" have similar meanings here. Here "voice" refers to what God has said. AT: "that you will completely obey everything Yahweh commands" (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-metonymy]])