KJV:
Having a good conscience; that, whereas they speak evil of you, as of evildoers, they may be ashamed that falsely accuse your good conversation in Christ.
NASB:
and keep a good conscience so that in the thing in which you are slandered, those who revile your good behavior in Christ will be put to shame.
KJV:
The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,) by the resurrection of Jesus Christ:
NASB:
Corresponding to that, baptism now saves you-- not the removal of dirt from the flesh, but an appeal to God for a good conscience-- through the resurrection of Jesus Christ,