Acts 23:9-13

And a great uproar occurred; and some of the scribes of the Pharisaic party stood up and started arguing heatedly, saying, “We find nothing wrong with this man; suppose a spirit or an angel has spoken to him?”

And when a great dissension occurred, the commander was afraid that Paul would be torn to pieces by them, and he ordered the troops to go down and take him away from them by force, and bring him into the barracks.

But on the following night, the Lord stood near him and said, “Be courageous! For as you have testified to the truth about Me in Jerusalem, so you must testify in Rome also.” A Conspiracy to Kill Paul

When it was day, the Jews formed a conspiracy and put themselves under an oath, saying that they would neither eat nor drink until they had killed Paul.

There were more than forty who formed this plot.