وَكَانَ فِي يَدِهِ رِسَالَةٌ تَحْمِلُ بُشْرَى لِأَهْلِ الدَّارِ.
In his hand was a letter carrying good news for the household.
Taḥmilu bushrā depicts a letter as carrying good news. In familiar usage the transfer need not be treated as a startling new metaphor; it expresses that the message contains and conveys information.
Not all conventional extensions have equal figurative force. Good analysis distinguishes an established manner of speaking from a newly striking image and notes its narrative purpose.