TSK · Mark 9:11

Behold, I send my messenger, and he shall prepare the way before me: and the Lord, whom ye seek, will suddenly come to his temple; and the messenger of the covenant, whom ye desire, behold, he cometh, saith Jehovah of hosts.

And if ye are willing to receive [it], this is Elijah, that is to come.

And there appeared unto them Elijah with Moses: and they were talking with Jesus.