Luke 3:8 commands bearing fruits of repentance; the crowd's question in verse 10 directly responds, asking what practical actions to take.

Acts 2:37 records the same question 'What shall we do?' from a convicted crowd after Peter's sermon — mirroring the response to John.

Acts 16:30 records the jailer's question 'What must I do to be saved?' — directly parallels the crowd's urgent inquiry after John's warning.