The verb form is used in several places and is often meaning to depart as thourhg a doorway. In the text it is a noun with ‘the’ preceding, denoting a thing or event. In the first several translations of the Bible the word departure was use to translate ‘apostasia’ Not until the Douay Rheims Bible was the different meaning applied, with ‘revolt’.
Have nice day
Actually, the Rheims Bible. A few later non-Catholic translations used departing,. as in ‘the departing’.