Moses continues to speak to the Israelites as if they are one person. He continues to remind them of what they should "call to mind" ([Deuteronomy 8:2](./01.md)). (See: [[rc://en/ta/man/translate/figs-you]])
Here "the mouth of Yahweh" is a metonym for the words that Yahweh says. AT: "people must obey the commands of Yahweh so they can live" or "people must do what Yahweh tells them to do so they can live" (See: [[rc://en/ta/man/translate/figs-metonymy]])