en_tn_condensed/act/02/37.md

General Information:

Here the word "they" refers to the people in the crowd to whom Peter spoke.

Connecting Statement:

The Jews respond to Peter's speech and Peter answers them.

when they heard this

"when the people heard what Peter had said"

they were pierced in their hearts

This can be stated in active form. AT: "Peter's words pierced their hearts" (See: rc://en/ta/man/translate/figs-activepassive)

pierced in their hearts

This means that the people felt guilty and became very sad. AT: "deeply troubled" (See: rc://en/ta/man/translate/figs-idiom)