The phrase "give knowledge" is a metaphor for teaching. The abstract nouns "salvation" and "forgiveness" can be expressed with the verbs "save" and "forgive." Alternate translation: "to teach his people salvation through the forgiveness of their sins" or "to teach his people how God saves people by forgiving their sins" (See: [[rc://en/ta/man/jit/figs-metonymy]] and [[rc://en/ta/man/jit/figs-abstractnouns]])