«أَسَرَّ نَجْوَاهُ فَلَانَتْ شَرَّتُهُ»
He confided a private message to him, and the severity of his temper softened.
Najwā is whispered or private conversation; sharrah indicates fierceness or sharpness. The furious figure in the preceding line now becomes pliable when a financial incentive enters the scene.
This can also work as a satirical image of how material gain changes human behaviour. It is an observation embedded in hyperbolic praise, not an endorsement of buying people’s goodwill.