"HOLY": God is calling us to be His set apart remnant in these last days; living out a walk of Humble, Obedience, Listening, to Yahweh!
It is by no coincidence that the Book of Ezekiel (our previous study) ends with the words "The Lord is there" and the Book of Leviticus opens with the words, "then the Lord called". God in His Holiness is calling JWF to have sweet fellowship with Him in a time when few are humble, few are obedient, and no one wants to listening . . .