en_tn_condensed/act/12/13.md

he knocked

"Peter knocked." Tapping on the door was a normal Jewish custom to let others know you wish to visit them. You may need to change this to fit your culture.

at the door of the gate

"at the outer door" or "at the door of the entrance from the street to the courtyard"

came to answer

"came to the gate to ask who was knocking"