You could say it was the Rambam.  Yes, his 13th principle of faith is "The dead will be resurrected."  But he made it clear he believed in a spiritual, not a bodily, resurrection, saying:

>All men must die equally, their bodies becoming dissolved into their constituent matter. [Rambam, Introduction to Sanhedrin 10]

The Ravad countered: 

>The words of this man seem to me to be very near to those who say there is no resurrection of the body, but only of the soul. By my life, this is not the view of the Sages. [Rabbi Avraham ben David of Posquières on Yad, Teshuvah 8:2]