Mahabharata 15.40.4

ततो व्यासो महातेजाः पुण्यं भागीरथीजलम्अवगाह्याजुहावाथ सर्वाँल्लोकान्महामुनिः

tato vyāso mahātejāḥ puṇyaṃ bhāgīrathījalamavagāhyājuhāvātha sarvām̐llokānmahāmuniḥ

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