And Paul, as his manner was, went in unto them
To the Jews in their synagogue; for though the Jews had put away the Gospel from them, and the apostle had turned to the Gentiles; yet he still retained a great affection for his countrymen the Jews, and as often as he had opportunity, attended their synagogues, in order to preach the Gospel to them;
and three sabbath days reasoned with them out of the Scriptures:
that is, out of the Old Testament, concerning the Messiah, the characters of him, the work that he was to do, and how he was to suffer and die for the sins of men; and this he did three weeks running, going to their synagogue every sabbath day, when and where the Jews met for worship; and made use of books, which they allowed of, and of arguments they could not disprove.