Shared ground
Acts 11:1–3 reports two facts side by side: (1) the wider community in Judea hears that non-Jews “also received the word of God,” and (2) Peter’s return to Jerusalem triggers an argument. The text frames the conflict as real and direct: they “contended with him” (not a quiet misunderstanding).
The stated problem is not first about Peter’s message but about his actions: he entered the home of uncircumcised men and ate with them. In this setting, entry and table fellowship signaled association and acceptance, so the complaint is about what Peter’s behavior publicly meant.
Where interpretation differs
Who are “those of the circumcision”? Some read this as a distinct subgroup within the Jerusalem believers who strongly guarded Jewish identity markers. Others read it more broadly as Jewish believers in general who assumed circumcision and meal boundaries should still shape community life.
What does “received the word of God” imply? At minimum it means the Gentiles welcomed the message as God’s word. Some also infer it points toward full acceptance into the believing community (since the news causes a major dispute), but that fuller meaning is not stated here.
What exactly is the objection about? Some interpret it mainly as concerns about ritual purity and boundary-keeping. Others emphasize social solidarity and communal authority: Peter’s shared meal is treated as recognizing Gentiles as acceptable partners without prior boundary steps.
Why the disagreement exists
The disagreement grows out of what Peter’s actions communicate in that world. Going into someone’s home and eating together was a public sign of close association. If circumcision marked covenant identity, then eating with uncircumcised Gentiles could look like crossing a line that many assumed still mattered for the community’s integrity.
What this passage clearly contributes
This short unit functions as a hinge: it shows that the Gentile inclusion question is not theoretical but immediately contested in Jerusalem. It also clarifies what sparked the dispute: not primarily a debate about preaching content, but Peter’s decision to share space and a meal with uncircumcised Gentiles. The text sets up the need for Peter’s explanation in what follows (Acts 11:4ff).