How do we negate "what" when it is in the accusative case?

The Shaykh : How does it become negated when it is connected? Because if we put it in the accusative case, it becomes: "what" is inflected entirely, and it functions as a fronted object for "you spend." It functions as a fronted object, and the object is in the accusative case. So if you say: the meaning becomes: "Say, you spend the pardon."
The student: It is clear now, O Shaykh, but how is it taken, and how does it become the answer?