Sanctify (agiason). First aorist active imperative of agiazw. To consecrate or set apart persons or things to God. See Exodus 28:41 ; Exodus 29:1Exodus 29:36 ; Exodus 40:13 . See Paul's prayer for the Thessalonians ( 1 Thessalonians 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).