The way a person lives is spoken of as if that person were walking on a path, and "to walk after" someone is a metonym for doing what that other person does or wants others to do. AT: "live obeying Yahweh" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-metonymy]])
These words all share similar meanings. Together they emphasize everything that Yahweh had commanded in the law. (See: [[rc://en/ta/man/translate/figs-doublet]])
# with all his heart and all his soul
The idiom "with all his heart" means "completely" and "with all his soul" means "with all his being." These two phrases have similar meanings. AT: "with all his being" or "with all his energy" (See: [[rc://en/ta/man/translate/figs-idiom]] and [[rc://en/ta/man/translate/figs-doublet]])
# that were written in this book
This can be translated in active form. AT: "that this book contained" (See: [[rc://en/ta/man/translate/figs-activepassive]])