'Error' in the Bible

So that any man who in error and without design has taken the life of another, may go in flight to them: and they will be safe places for you from him who has the right of punishment for blood.

These were the towns marked out for all the children of Israel and for the man from a strange country living among them, so that anyone causing the death of another in error, might go in flight there, and not be put to death by him who has the right of punishment for blood till he had come before the meeting of the people.