"Platonism for the Masses"

I wonder if anyone might be good enough to help me track down a reference of
Heidegger's to Nietzsche.

On page 80 of the Niemeyer edition of GA40 (Einfuehrung in die Metaphysik)
Heidegger quotes Nietzsche, saying "Nieztsche sagt daher mit Recht:
Christentum ist Platonismus fuers Volk" (Therefore Nietzsche rightly says:
Christianity is Platonism for the masses").

My Nietzsche is a bit rusty.  Does anyone know where Heidegger is quoting
from?  I would be grateful for either a German or an English reference.

Many thanks.

Laurence



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