Mahabharata 13.147.9

युधिष्ठिर उवाच · yudhiṣṭhira uvāca

प्रत्यक्षं लोकतः सिद्धं लोकाश्चागमपूर्वकाःशिष्टाचारो बहुविधो ब्रूहि तन्मे पितामह

pratyakṣaṃ lokataḥ siddhaṃ lokāścāgamapūrvakāḥśiṣṭācāro bahuvidho brūhi tanme pitāmaha

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