tatra brahmarsayah sarve
devarsayas ca sattama
rajarsayas ca tatrasan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Just to see the chief of the descendants of King Bharata [Bhisma], all the great souls in the universe, namely the rsis amongst the demigods, brahmanas and kings, all situated in the quality of goodness, were assembled there.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The rsis are those who have attained perfection by spiritual achievements. Such spiritual achievements can be earned by all, whether one is a king or a mendicant. Bhismadeva himself was also one of the brahmarsis and the chief of the descendants of King Bharata. All rsis are situated in the quality of goodness. All of them assembled there on hearing the news of the great warrior’s impending death.