Surah 47. Muhammad, Ayah 21

I.e., an expression of readiness to fight in His cause: which is obviously the meaning of qawl ma'ruf in this context.

The resolution is not taken except under guidance from Allah. Those, therefore, who fail to implement it by their own effort and sacrifice, are not true to Allah. And such disloyalty or cowardice is not even good for them from a worldly point of view. With what face can they meet their friends after their disgraceful conduct?