Acts 26:7

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.

This is part of Paul's defense speech delivered before King Agrippa. Its immediate setting was a Jewish dispute over Jesus, who had died and whom Paul declared to be alive, with no further elaboration of the promise, the twelve tribes, or the hope. The twelve tribes, in serving God continually day and night, shared the hope of reaching God's promise, and Paul was accused by the Jews because of this hope.

The speech containing it is a model of dignified courtesy and persuasive eloquence. While a prisoner under accusation, Paul's testimony about Jesus, his conversion, and the gospel brought knowledge of Christ before kings, governors, rulers, and nobles, so his suffering and accusation became a means of spreading the gospel. It illustrates the pattern where the gospel shut out from the pulpit is proclaimed in a palace and heard by princes and lords of the empire.