Mahabharata 3.200.2

श्रुतिप्रमाणो धर्मो हि वृद्धानामिति भाषितम्सूक्ष्मा गतिर्हि धर्मस्य बहुशाखा ह्यनन्तिका

śrutipramāṇo dharmo hi vṛddhānāmiti bhāṣitamsūkṣmā gatirhi dharmasya bahuśākhā hyanantikā

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