from: http://bible.oremus.org/?ql=144390342

12 In the morning the Jews joined in a conspiracy and bound themselves by an oath neither to eat nor drink until they had killed Paul. ¹³There were more than forty who joined in this conspiracy. ¹⁴They went to the chief priests and elders and said, ‘We have strictly bound ourselves by an oath to taste no food until we have killed Paul. ¹⁵Now then, you and the council must notify the tribune to bring him down to you, on the pretext that you want to make a more thorough examination of his case. And we are ready to do away with him before he arrives.’

16 Now the son of Paul’s sister heard about the ambush; so he went and gained entrance to the barracks and told Paul. ¹⁷Paul called one of the centurions and said, ‘Take this young man to the tribune, for he has something to report to him.’ ¹⁸So he took him, brought him to the tribune, and said, ‘The prisoner Paul called me and asked me to bring this young man to you; he has something to tell you.’ ¹⁹The tribune took him by the hand, drew him aside privately, and asked, ‘What is it that you have to report to me?’ ²⁰He answered, ‘The Jews have agreed to ask you to bring Paul down to the council tomorrow, as though they were going to inquire more thoroughly into his case. ²¹But do not be persuaded by them, for more than forty of their men are lying in ambush for him. They have bound themselves by an oath neither to eat nor drink until they kill him. They are ready now and are waiting for your consent.’ ²²So the tribune dismissed the young man, ordering him, ‘Tell no one that you have informed me of this.’

23 Then he summoned two of the centurions and said, ‘Get ready to leave by nine o’clock tonight for Caesarea with two hundred soldiers, seventy horsemen, and two hundred spearmen. ²⁴Also provide mounts for Paul to ride, and take him safely to Felix the governor.’