فَقَالَ لَهُمْ رَسُولُ اللَّهِ نَاقَةَ اللَّهِ وَسُقْيَاهَا
Then Allah’s messenger said to them: Beware concerning Allah’s she-camel and her turn to drink. (91:13)
Nāqata Allāh is accusative. A recognized reading treats it as an expression of warning with an understood verb such as “beware.” The omitted element is recoverable from context, making this a useful case of ellipsis.
Wa-suqyāhā adds the camel’s right to water to the warning. Here wāw coordinates two items within one warning; it is not a test case for joining two independent declarative clauses.