«سَقَى اللَّهُ دِيَارَكَ غَيْرَ مُفْسِدِهَا»
May God water your homes without damaging them.
A prayer for rain expresses good, but excessive rain could also cause harm. The qualifier «غَيْرَ مُفْسِدِهَا» removes that unwanted possibility. Its role is iḥtirās—a safeguard—not needless padding.
For an expression to count as iḥtirās, the earlier wording must reasonably allow an unintended interpretation, and the added phrase must specifically block that possibility.