Mahabharata 8.30.66

व्रात्यानां दाशमीयानां कृतेऽप्यशुभकर्मणाम्इति पाञ्चनदं धर्ममवमेने पितामहःस्वधर्मस्थेषु वर्णेषु सोऽप्येतं नाभिपूजयेत्

vrātyānāṃ dāśamīyānāṃ kṛte'pyaśubhakarmaṇāmiti pāñcanadaṃ dharmamavamene pitāmahaḥsvadharmastheṣu varṇeṣu so'pyetaṃ nābhipūjayet

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