In qalb jinās, the underlying letters are the same or closely matched in identity and number, but their sequence changes. Rather than adding a new consonant, the expression redistributes the existing ones.
«حُسامُه فَتحٌ لأوليائه حَتفٌ لأعدائه»
His sword brings victory to his allies and death to his enemies.
The words «فتح» and «حتف» rearrange essentially the same consonantal material. Their opposed meanings, victory and death, heighten praise by creating a concise and forceful verbal correspondence.