Acts 23:12-14

12Now when day came, the Jews formed a conspiracy and bound themselves under an oath (curse), saying that they would not eat or drink until they had killed Paul.

13There were more than forty [men] who formed this plot [and swore this oath].

14They went to the chief priests and elders and said, “We have bound ourselves under a solemn oath not to taste anything [neither food nor drink] until we have killed Paul.