{Sanctify} (hagiason). First aorist active imperative of
hagiaz(935c). To consecrate or set apart persons or things to God.
See  Ex 28:41  29:1,36  40:13 . See Paul's prayer for the
Thessalonians ( 1Th 5:23 ). This is done in the sphere (en) of
truth (God's truth), God's Word (not human speculation, but God's
message to us).