OET interlinear YHN (JHN) 1:33

uW Translation Notes:

Note 1 topic: figures-of-speech / explicit

κἀγὼ οὐκ ᾔδειν αὐτόν

(Some words not found in SR-GNT: Κἀγώ οὐκ ᾔδειν αὐτόν ἀλλʼ ὁ πέμψας μέ βαπτίζειν ἐν ὕδατι ἐκεῖνος μοί εἶπεν Ἐφʼ ὅν ἄν ἴδῃς τό Πνεῦμα καταβαῖνον καί μένον ἐπʼ αὐτόν οὗτος ἐστίν ὁ βαπτίζων ἐν Πνεύματι Ἁγίῳ)

John means that he did not know previously that Jesus was the Messiah. It does not mean that he didn’t recognize who Jesus was when he saw him. You could include this information if that would be helpful to your readers. Alternate translation: [And I did not recognize that he was the Messiah]

Note 2 topic: figures-of-speech / explicit

ὁ πέμψας με βαπτίζειν ἐν ὕδατι, ἐκεῖνός

the_‹one› ˓having˒_sent the_‹one› (Some words not found in SR-GNT: Κἀγώ οὐκ ᾔδειν αὐτόν ἀλλʼ ὁ πέμψας μέ βαπτίζειν ἐν ὕδατι ἐκεῖνος μοί εἶπεν Ἐφʼ ὅν ἄν ἴδῃς τό Πνεῦμα καταβαῖνον καί μένον ἐπʼ αὐτόν οὗτος ἐστίν ὁ βαπτίζων ἐν Πνεύματι Ἁγίῳ)

Here, the phrases the one who sent me and that one both refer to God. You could include this information if that would be helpful to your readers. Alternate translation: [God, who sent me to baptize in water,]

Note 3 topic: figures-of-speech / metaphor

οὗτός ἐστιν ὁ βαπτίζων ἐν Πνεύματι Ἁγίῳ

(Some words not found in SR-GNT: Κἀγώ οὐκ ᾔδειν αὐτόν ἀλλʼ ὁ πέμψας μέ βαπτίζειν ἐν ὕδατι ἐκεῖνος μοί εἶπεν Ἐφʼ ὅν ἄν ἴδῃς τό Πνεῦμα καταβαῖνον καί μένον ἐπʼ αὐτόν οὗτος ἐστίν ὁ βαπτίζων ἐν Πνεύματι Ἁγίῳ)

John the Baptist is using literal baptism, which puts a person under water, to refer to spiritual baptism, which puts people under the influence of the Holy Spirit, who purifies them. If this might confuse your readers, you could express the meaning plainly. Alternate translation: [he is the one who will put you under the influence of the Holy Spirit, who will purify you]