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Verse 5-69 is a list of different types of believers, muslims, jews, christians and the mysterious Sabians.
As the list begins with "inna" all the elements of the list must be in the direct case, which is called nasb in arabic language.
The only word on which the case can be seen is the word Sabians.
In the similar verse in 2-62 the word Sabians is correctly in the nasb case, that is saabieena.
What is the explanation for the word Sabians in 5-69 being in the subject case (rafa' in arabic) that is saabioona ?