en_tn/act/04/01.md

captain of the temple

chief security guard of the temple

came upon them

"approached them" or "came to them"

They were deeply troubled

Peter taught about Jesus and his resurrection from the dead. This troubled the Sadducees because they did not believe in Jesus' resurrection from the dead.

the number of the men

specifically males. Any women and children who were there were not included in the count.

since it was now evening

It was common practice not to question people at night.

was about five thousand

"became about five thousand" or "grew to about five thousand".