Obey
AKA
Obey. tēreō.
Guard
Observe
Definition
keep (57x), reserve (8x), observe (4x), watch (2x), preserve (2x), keeper (1x), hold fast (1x).
KJV translations according to Strong’s
to attend to carefully, take care of; to guard, metaph. to keep, one in the state in which he is, to observe, to reserve: to undergo something
Outline of Biblical Usage
The KJV uses the word observe, but it also sees this word as more than just an observant behavior, it also sees it as preserving and holding fast.