Peter seeing him saith to Jesus, Lord, and what [shall] this man [do]?
Berean Study Bible (BSB) - John 21:21 >When Peter saw him, he asked, “Lord, what about him?”
Textus Receptus (TR) - John 21:21 >Τοῦτον ἰδὼν ὁ Πέτρος λέγει τῷ Ἰησοῦ, Κύριε, οὗτος δὲ τί;