Mahabharata 12.326.106

ये त्वन्ये ब्रह्मसदने सिद्धसंघाः समागताःतेभ्यस्तच्छ्रावयामास पुराणं वेदसंमितम्

ye tvanye brahmasadane siddhasaṃghāḥ samāgatāḥtebhyastacchrāvayāmāsa purāṇaṃ vedasaṃmitam

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