This is a command to stand. This phrase refers to beginning to act on something. Alternate translation: "Take action" (See: [[rc://en/ta/man/jit/figs-idiom]])
The abstract noun "faithfulness" can be translated as an adjective. Alternate translation: "to show that you are faithful to your covenant" (See: [[rc://en/ta/man/jit/figs-abstractnouns]])