Mahabharata 3.209.13

विपाप्मा कलुषैर्मुक्तो विशुद्धश्चार्चिषा ज्वलन्विपापोऽग्निः सुतस्तस्य सत्यः समयकर्मसु

vipāpmā kaluṣairmukto viśuddhaścārciṣā jvalanvipāpo'gniḥ sutastasya satyaḥ samayakarmasu

Our plain-language meaning of this verse is waiting for scholar review.