Our twelve tribes — For a great part of the ten tribes also had at various times returned from the east to their own country, James 1:1; 1 Peter 1:1. Worshipping continually night and day — That is, this is what they aim at in all their public and private worship.
Related Commentaries of Acts 26:7
Acts 26:7
7 Unto which promise our twelve tribes, instantly serving God day and night, hope to come. For which hope's sake, king Agrippa, I am accused of the Jews.