Mbh 13.26.1a

"Vaisampayana said,--'Equal unto Vrihaspati in intelligence and Brahma himself in forgiveness, resembling Sakra in prowess and Surya in energy, Bhishma the son of Ganga, of infinite might, had been overthrown in battle by Arjuna. Accompanied by his brothers and many other people, king Yudhisthira asked him these questions. The old hero was lying on a bed that is coveted by heroes, in expectation of that auspicious time when he could take leave of the physical frame. Many great Rishis had come there for seeing that foremost one of Bharata's race. Amongst them were Atri and Vasishtha and Bhrigu and Pulastya and Pulaha and Kratu. There were also Angiras and Gotama and Agastya and Sumati of well-restrained soul, and Viswamitra and Sthulasiras and Samvarta and Pramati and Dama. There were also Vrihaspati and Usanas, and Vyasa and Chyavana and Kasyapa and Dhruva, and Durvasas and Jamadagni and Markandeya and Galava, and Bharadwaja and Raibhya and Yavakrita and Trita. There were Sthulaksha and Savalaksha and Kanwa and Medhatithi and Krisa and Narada and Parvata and Sudhanwa and Ekata and Dwita. There were also Nitambhu and Bhuvana and Dhaumya and Satananda and Akritavrana and Rama, the son of Jamadagni and Kacha. All these high-souled and great Rishis came there for seeing Bhishma lying on his bed of arrows. Yudhishthira with his brothers duly worshipped those high-souled Rishis who had come there, one after another in proper order. Receiving that worship, those foremost of Rishis sat themselves down and began to converse with one another. Their conversation related to Bhishma, and was highly sweet and agreeable to all the senses. Hearing that talk of theirs having reference to himself, Bhishma became filled with delight and regarded himself to be already in heaven. Those Rishis then, having obtained the leave of Bhishma and of the Pandava princes, made themselves invisible, vanishing in the very sight of all the beholders.