Mbh 3.81.2

“Narada said, ‘Listen, O king, with attention, to what the intelligent Bhishma had heard before from Pulastya! Once, O blessed one, that foremost of virtuous men, Bhishma, while in the observance of the Pitrya vow, lived, O king, in the company of Munis in a delightful and sacred region, near the source of the Ganga, that is resorted to by the celestial Rishis and Gandharvas and the celestials themselves. And while living there, the resplendent one gratified with his oblations the Pitris, the gods and the Rishis, according to the rites inculcated in the scriptures. And once on a time while the illustrious one was engaged in his silent recitations, he beheld Pulastya--that best of Rishis, of wonderful appearance. And beholding that austere ascetic blazing with beauty, he was filled with great delight and exceeding wonder. And, O Bharata, that foremost of virtuous men, Bhishma, then worshipped that blessed Rishi according to the rites of the ordinance. And purifying himself and with rapt attention, he approached that best of Brahmarshis, with the Arghya on his head. And uttering aloud his name, he said, ‘O thou of excellent vow, blessed be thou, I am Bhishma, thy slave. At sight of thee, I am freed from all my sins.’ And saying this, that foremost of virtuous men, Bhishma, restraining speeches stood, O Yudhishthira, in silence and with joined hands. And beholding Bhishma that foremost of the Kurus, reduced and emaciated by the observance of vows and the study of the Vedas, the Muni became filled with joy.”