Verse 5: "And he who sat upon the throne said, 'Behold, I make all things new.' Also he said, 'Write this, for these words are trustworthy and true.'"

"the throne" is the throne of David which Baha'u'llah sat upon. Both Jesus and Baha'u'llah were descendants of King David making them "Christs." The meaning of the word "Christ" is a male sperm descendant of King David that is anointed.