Commentary for Avodah Zarah 129:2
והאמר רבה בר בר חנה א"ר יוחנן גר תושב שעברו עליו י"ב חדש ולא מל הרי הוא כמין שבעובדי כוכבים התם כגון שקיבל עליו למול ולא מל
But did not Rabbah b. Bar Hanah say in the name of R. Yohanan: A ger toshav who allows twelve months to pass without becoming circumcised is to be regarded as a heretic among idolaters! This refers to a case where he accepted upon himself to be circumcised but did not circumcise.
Daf Shevui to Avodah Zarah
The Talmud responds with another difficulty. According to this baraita, becoming a ger toshav is the first step on the way to full conversion. The ger toshav has twelve months in which to convert. If he does not convert within this time period, he is considered to be a heretic and one certainly should not give him a gift. We can assume that Avidarna was not circumcised.
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Daf Shevui to Avodah Zarah
Judah responds that this statement refers only to a case where the non-Jew promised to be circumcised but changed his mind. In other words, once a non-Jew accepts not to worship idols and to be circumcised, changing his mind is basically impossible. Accepting these things has essentially made him a Jew and there is no going back. But one can become a ger toshav and never want to fully convert. Avidarna never accepted upon himself to circumcise and therefore he need not do so.
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