'Unawares' in the Bible

then you shall select for yourselves cities to be cities of refuge, so that the one who kills any person unintentionally may escape there.

These six cities shall be a refuge for the Israelites and for the stranger and the resident alien among them; so that anyone who kills a person unintentionally may escape there.

Let destruction come upon my enemy by surprise;Let the net he hid for me catch him;Into that very destruction let him fall.