The Safeguard against drifting (2:1)
Give “more earnest” (Mark 10:23-26) “heed” (beware, pay attention, be on guard) to the things we have heard ie: New Testament revelation (Hebrews 2:3b-4)
Drift - pararheo (para “close beside” rheo “to float or drift as carried along by current”

The Seriousness of Drifting (2:2-3a)
Drifting is so serious because it is not drifting away from some duty, it is drifting away from a person, Jesus Christ (Hebrews 1:5-13)

The Definition of Drifting (2:3a)
Neglect - amelo (a “not” melo “have concern/be affected” - Matthew 22:1-5)