John 1:36

1:36 Gazing at Jesus as he walked by, he said, “Look, the Lamb of God!” ¹ 

John 1:42

1:42 Andrew brought Simon ²  to Jesus. Jesus looked at him and said, “You are Simon, the son of John. ³  You will be called Cephas” (which is translated Peter). ⁴ 

[1:36]  ¹ sn This section (1:35-51) is joined to the preceding by the literary expedient of repeating the Baptist’s testimony about Jesus being the Lamb of God (1:36, cf. 1:29). This repeated testimony (1:36) no longer has revelatory value in itself, since it has been given before; its purpose, instead, is to institute a chain reaction which will bring John the Baptist’s disciples to Jesus and make them Jesus’ own disciples.

[1:42]  ² tn Grk “He brought him”; both referents (Andrew, Simon) have been specified in the translation for clarity.

[1:42]  ³ tc The reading “Simon, son of John” is well attested in Ì^66,75,106 א B* L 33 pc it co. The majority of mss (A B² Ψ Ë^1,13 Ï) read “Simon, the son of Jonah” here instead, but that is perhaps an assimilation to Matt 16:17.

[1:42]  ⁴ sn This is a parenthetical note by the author. The change of name from Simon to Cephas is indicative of the future role he will play. Only John among the gospel writers gives the Greek transliteration (Κηφᾶς, Khfas) of Simon’s new name, Qéphâ (which is Galilean Aramaic). Neither Πέτρος (Petros) in Greek nor Qéphâ in Aramaic is a normal proper name; it is more like a nickname.