'Curse' in the Bible

When it was day, some of the Jews banded together, and bound themselves under a curse, saying that they would neither eat nor drink until they had killed Paul.

They came to the chief priests and the elders, and said, "We have bound ourselves under a great curse, to taste nothing until we have killed Paul.

Therefore don't yield to them, for more than forty men lie in wait for him, who have bound themselves under a curse neither to eat nor to drink until they have killed him. Now they are ready, looking for the promise from you."