'Be Ready' in the Bible

Then Paul took the men and the next day he observed the ceremony of purification with them. Then he went into the Temple, declaring [to the priest] when he would fulfill the [required] days of the purification [ceremony] and [be ready] for the sacrifices to be offered for each of them.

Now then, you and the Council must notify the tribune to bring him down to you on the pretext that you want to look into his case more carefully, but before he arrives we'll be ready to kill him."