Malachi 4:4-6 NIV

[4] “Remember the law of my servant Moses, the decrees and laws I gave him at Horeb for all Israel. [5] “See, I will send the prophet Elijah to you before that great and dreadful day of the LORD comes. [6] He will turn the hearts of the parents to their children, and the hearts of the children to their parents; or else I will come and strike the land with total destruction.”