Malachi 4:4-6

Young's Literal Translation

⁴ Remember ye the law of Moses My servant, That I did command him in Horeb, For all Israel -- statutes and judgments.

⁵ Lo, I am sending to you Elijah the prophet, Before the coming of the day of Jehovah, The great and the fearful.

⁶ And he hath turned back the heart of fathers to sons, And the heart of sons to their fathers, Before I come and have utterly smitten the land!