Atos 23:12-15

Paul’s adversaries (cf. Acts 21:27-29) evidently agreed together not to taste food or drink again until Paul was dead (cf. John 16:2). Their plan was to have the chief priests and elders of Israel ask the Roman commander to return Paul to the Sanhedrin for further questioning. Assassins planned to kill him somewhere on the streets between the Fortress of Antonia and the hall of the Sanhedrin. These buildings were not far apart. They surely realized that Paul’s Roman guards might kill some of their number in the process.

"The oath was not so suicidal as it seems, since provision was made by the rabbis for releasing participants from the consequences of failure to carry out their purpose if external circumstances had made it impossible." [Note: Neil, p. 230.]