en_tn/act/10/27.md

talking with him

talking with Cornelius

found many people gathered together

"found many gentile people gathered together". It is implied that the people Cornelius invited were Gentiles. (see: rc://en/ta/man/translate/figs-explicit)

it is not lawful for a Jewish man

"it is forbidden for a Jewish man"

You yourselves know

Peter is addressing Cornelius and his invited guests.

So I ask you why you sent for me."

Though Peter is directing the question toward Cornelius, "you" includes the Gentiles present (plural).