The RSV renders it similarly, but the AV and NKJV talk of baptism as the answer of a good conscience towards God.

The NIV renders it 'the pledge of a good conscience towards God' which is somewhat ambiguous as a 'pledge' can be either 'the downpayment given to us which guarantees that eventually we will receive the real thing' or 'the oath which we make to God'. In its margin the NIV substitutes 'response' for 'pledge'.