He will go before him in the spirit and power of Elijah, 'to turn the hearts of the fathers to the children,' and the disobedient to the wisdom of the just; to make ready a people prepared for the Lord."
That was the last word of God to man in the old covenant period, prior to the angel meeting Zacharias there at the altar of the Lord. And it is interesting though the Lord has been silent for four hundred years, that very promise, which was the last promise of the old testament, is the first word of the Lord in the new testament, which is the fulfillment of that prophesy, which is about to take place, as this child that will be born, will go forth in the spirit and in the power of Elijah.