Matthew 17:12
Elijah is come already (Eleiav hdh hlqen). Thus Jesus identifies John the Baptist with the promise in Malachi, though not the real Elijah in person which John denied (John 1:21).
They knew him not (ouk epignwsan auton). Second aorist active indicative of epiginwskw, to recognize. Just as they do not know Jesus now (John 1:26). They killed John as they will Jesus the Son of Man.
