Acts 15:5
But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses.
Cross-references
Acts 15:1 introduces the same teaching that circumcision is required, which Acts 15:5 identifies as coming from believing Pharisees.
Acts 15:24 refers back to the same troublemakers, stating they were unauthorized, while Acts 15:5 names them as believing Pharisees.
Acts 21:20 shows many Jewish believers still zealous for the law, echoing the insistence of the Pharisee believers at the council.
Acts 11:2 shows earlier opposition from the 'circumcision party' to Peter eating with Gentiles, the same group later arguing for circumcision.
Acts 26:5 reveals Paul's own Pharisee background, giving context to the party that argued for circumcision.
Galatians 5:1-3 directly opposes the Pharisee believers' view by warning that accepting circumcision obligates one to the whole law.
Philippians 3:5-8 shows Paul counting his Pharisee credentials as loss, contrasting with those who still insist on law.
1 Corinthians 7:18 teaches not to seek circumcision—directly opposing the Pharisees in Acts 15:5 who demand it for Gentiles.
Galatians 6:12 describes those who force circumcision to avoid persecution—exactly the Pharisees in Acts 15:5 who insist on it.