Reference for Pesachim 183:5

גר שנתגייר וכו': אמר רבה בר בר חנה א"ר יוחנן מחלוקת בערל נכרי

A PROSELYTE WHO WAS CONVERTED etc. Rabbah B'Bar Hanah said in R'Johanan's name: The controversy is in respect of an uncircumcised heathen, where Beth Hillel hold: [He is forbidden to eat in the evening] as a preventive measure lest he become defiled the following year [by the dead] and he argues, 'Did I not perform tebillah last year and eat [of the Passover offering]?

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