Cross reference
Acts 24:13
13 nor are they able to prove against me the things concerning which they now accuse me.
Acts 25:7
7 and he having come, there stood round about the Jews who have come down from Jerusalem -- many and weighty charges they are bringing against Paul, which they were not able to prove,
1 Peter 3:16
16 having a good conscience, that in that in which they speak against you as evil-doers, they may be ashamed who are traducing your good behaviour in Christ;