Apostacy from the faith occurs in two ways—by loosing something God has bound or by binding something God has loosed.
This is a departure from sound doctrine because the inspired apostles were the men God specifically chose to bind on earth what had already been bound in heaven and to loose on earth what had already been loosed in heaven (Matthew 16:19; 18:18). Therefore, continuing steadfastly in the apostles’ doctrine (Acts 2:42) is the fundamental hallmark of the New Testament church.
Since this faith was once for all delivered to the saints in the first century (Jude 3), there is absolutely no need for anyone to bind or loose nor draw lines of fellowship where God has not. Yet, it is this very thing which change agents do. These sensual persons “cause divisions” (Jude 19).
The word employed by Jude is quite graphic. Apodiorizo is comprised of two prepositions—apo and dia—and the verb horizo (from which we get the English word “horizon”). When compounded together, these components create a word which designates someone who draws an unauthorized boundary line through the church and divides God’s people according to this presumptuous line of fellowship.
Truly such ungodly, carnal people do not have a spiritual mindset (Jude 19). They are spiritual black holes (Jude 13).