Why did Peter take some fellow Jewish believers with him to Cornelius's house?
He was still a law-keeping Jew and had apprehension about entering that household, so he brought several fellow Jewish believers from Joppa to Caesarea. Scripture does not state exactly how many, only that some brethren accompanied him. This occurred about ten years after Pentecost, showing the law had not yet been set aside.
Les explains that Acts 10 records Cornelius at Caesarea being prompted by God to send for Peter, who was down the coast 80–90 miles in Joppa. Peter, by God's urging and miraculous working, finally reached Cornelius's house. Yet Peter was still a good law-keeping Jew and had trepidation about going to that household. For this reason, Les suggests, Peter took several fellow Jewish believers with him from Joppa to Caesarea. Scripture does not say exactly how many, only that some brethren came with him. This was about ten years after Pentecost and the crucifixion, so the law had not been set aside; Peter's vision in Acts 10:14 still involved unclean animals, and he had not been set free from the law.
More Questions
How did Peter end up going to Cornelius's house in Caesarea?
God orchestrated Peter's meeting with Cornelius: Cornelius was prompted by God to send for Peter, and Peter, who was 80-90 miles away in Joppa, was brought to Cornelius's house by God's urging and miraculous working.
How many brothers came with Peter to Cornelius's house?
The Bible does not say exactly how many brethren came with Peter from Joppa, only that some of the brethren came with him.
What did Peter say to Cornelius about a Jew associating with a Gentile?
Peter told Cornelius at the threshold of his house that it was unlawful for him, a Jew, to keep company with a Gentile, which illustrates how strong the Jew-Gentile separation was right before God turned to the Gentiles.