The Lord Desires For Us To Live Holy Lives
Leviticus 20:26 (ESV) … “You shall be holy to me, for I the Lord am holy and have separated you from the peoples, that you should be mine.”
The Book of Leviticus, without doubt, is one of the most neglected of the Old Testament precisely because modern Christians fail to see what relevance it has to contemporary life. When one realizes, however, that its principal themes or ideals—the holiness of God, His covenant with His people, and the resultant demands for holy living—are timeless and irrevocable, the pertinence of the book becomes immediately evident.
God chose Israel to be His servant people and to represent Him and His saving purposes on the earth. This same God in Jesus Christ has redeemed a people in this day to serve a corresponding function. The sacrifices, rituals, ceremonies, and holy days may have lost their legal status for the church. But the principles of holiness they embodied and demonstrated are principles that must characterize the people of the Lord of every generation if they are to serve Him effectively as salt and light.
 Dockery, D. S. (Ed.). (1992). Holman Bible Handbook (p. 160). Nashville, TN: Holman Bible Publishers.