وَمَا قَلَىٰ
Nor became displeased.
The previous clause mā waddaʿaka supplies an explicit object suffix, whereas mā qalā leaves the corresponding object unspoken. The intended referent is recoverable from context, making this a legitimate example for discussing ellipsis.
Avoid presenting a single proposed motive—rhythm, tenderness or decorum—as certain without argument. The omission is observable; explanations of its full rhetorical purpose may differ.