SB 9.6.54
tatra taptva tapas tiksnam
atma-darsanam atmavan
sahaivagnibhir atmanam
yuyoja paramatmani
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When Saubhari Muni, who was quite conversant with the self, went to the forest, he performed severe penances. In this way, in the fire at the time of death, he ultimately engaged himself in the service of the Supreme Personality of Godhead.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
At the time of death, fire burns the gross body, and if there is no more desire for material enjoyment the subtle body is also ended, and in this way a pure soul remains. This is confirmed in Bhagavad-gita (tyaktva deham punar janma naiti). If one is free from the bondage of both the gross and subtle material bodies and remains a pure soul, he returns home, back to Godhead, to be engaged in the service of the Lord. Tyaktva deham punar janma naiti mam eti: he goes back home, back to Godhead. Thus it appears that Saubhari Muni attained that perfect stage.