Sanctification
is,


Being made holy.
(The act of God's grace by which men are purified from sin and the world, and exalted
to a supreme love to God.)


Also, The act of separating

and
setting apart
for
the service and
worship
of God
For this is the will of God,
even your sanctification,
that you should abstain from fornication;
that every one of you should know
how to possess his vessel
in sanctification and honour;
not in the lust of concupiscence,
even as the Gentiles which know not God.

1 Thessalonians 4:3-5