لَيْسَ كَمِثْلِهِ شَيْءٌ
There is nothing like His likeness.
One grammatical analysis of the verse treats the kāf as additional for emphasis. The intended negation is then equivalent to the forceful “laysa mithlahu shayʾ,” denying anything comparable to Him. “Additional” here does not mean devoid of rhetorical effect.
The case contrast matters: in the reconstructed construction, “mithlahu” would stand as the accusative predicate of “laysa.” In the expressed construction, the initial kāf governs the genitive form “mithlihi.” The example therefore illustrates the second mechanism, case change associated with addition.