The abstract noun "life" can be translated as the verb "live." You may need to make explicit the metonymy of obeying the law, which represents the law itself. Alternate translation: "because you will live if you obey it" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Long days are a metaphor for a long life. See how you translated these words in [Deuteronomy 4:26](../04/26.md). Alternate translation: "be able to live a long time" (See: [[rc://en/ta/man/translate/figs-metaphor]])