Mahabharata 12.322.51
उत्पन्नेऽऽङ्गिरसे चैव युगे प्रथमकल्पितेसाङ्गोपनिषदं शास्त्रं स्थापयित्वा बृहस्पतौ
utpanne''ṅgirase caiva yuge prathamakalpitesāṅgopaniṣadaṃ śāstraṃ sthāpayitvā bṛhaspatau
Our plain-language meaning of this verse is waiting for scholar review.
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