The next morning the Jews formed a conspiracy1 and bound themselves with an oath not to eat or drink until they had killed Paul.2
References for Acts 23:12
More than forty men were involved in this plot.
They went to the chief priests and elders and said, "We have taken a solemn oath not to eat anything until we have killed Paul.
References for Acts 23:14
Now then, you and the Sanhedrin3 petition the commander to bring him before you on the pretext of wanting more accurate information about his case. We are ready to kill him before he gets here."
References for Acts 23:15