Elijah has been here (Mk 9:13-9:13)

“But I tell you

‘That Elijah has come.

They did to him

Whatever they pleased,

As it is written of him.’”

 

ἀλλὰ λέγω ὑμῖν ὅτι καὶ Ἡλείας ἐλήλυθεν, καὶ ἐποίησαν αὐτῷ ὅσα ἤθελον, καθὼς γέγραπται ἐπ’ αὐτόν.

 

Much like Matthew, chapter 17:12, Mark said that Jesus spoke to his disciples with a solemn pronouncement (ἀλλὰ λέγω ὑμῖν).  He said that Elijah had already come (ὅτι καὶ Ἡλείας ἐλήλυθεν), but they did to him whatever they pleased or wanted to do (καὶ ἐποίησαν αὐτῷ ὅσα ἤθελον).  Thus, it is written about him (καθὼς γέγραπται ἐπ’ αὐτόν).  There is no clear link here of Elijah to John the Baptist as there was in Matthew, but it might be implied.