John 13:19

19I am telling you this now,
Or (perhaps) “I am certainly telling you this.” According to BDF #12.3 ἀπ᾿ ἄρτι (ap arti) should be read as ἀπαρτί (aparti), meaning “exactly, certainly.”
before it happens, so that when it happens you may believe
Grk “so that you may believe.”
that I am he.
Grk “that I am.” R. E. Brown (John [AB], 2:555) argues for a nonpredicated ἐγώ εἰμι (egō eimi) here, but this is far from certain.
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