The words “sanctify” and “sanctification” have deep roots in the Old Testament. There, holiness is about nearness to the presence of God. He is the holy-maker. Sanctification is his gift. The Old Testament helps us to avoid the common misunderstanding today that sanctification is all about our life of good works.
What do Abraham's near-sacrifice of Isaac, the place where David built an altar to stop a plague, and the temple of Solomon all have in common? All three were on the same mountain. On this mountaintop, you can see the whole story of salvation.