Paul went to places of prayer on the Sabbath day

ACTS 16:13

13 And on the Sabbath we went out of the city by the river side, where prayer was accustomed to be made; and we sat down, and spoke to the women who resorted there.

Note: This took place in Philippi (v12), where Paul went after seeing a vision which called him to go into Macedonia (v9). It seems that the religious people of Philippi gathered by the river on the Sabbath day for prayer, and this is where Paul went to minister the gospel of salvation. This not only shows Paul's habit of looking for religious gatherings on the Sabbath day, but also shows that many Gentiles also gathered together on the Sabbath at that time also. As a result of this meeting, God opened the heart of Lydia, a seller of purple from Thyatira, and she and her household believed and were baptised (vv14-15).