Bg 8.16
a-brahma-bhuvanal lokah
punar avartino ’rjuna
mam upetya tu kaunteya
punar janma na vidyate
Word for word:
a-brahma-bhuvanat — up to the Brahmaloka planet; lokah — the planetary systems; punah — again; avartinah — returning; arjuna — O Arjuna; mam — unto Me; upetya — arriving; tu — but; kaunteya — O son of Kunti; punah janma — rebirth; na — never; vidyate — takes place.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
From the highest planet in the material world down to the lowest, all are places of misery wherein repeated birth and death take place. But one who attains to My abode, O son of Kunti, never takes birth again.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
All kinds of yogis – karma, jnana, hatha, etc. – eventually have to attain devotional perfection in bhakti-yoga, or Krishnaconsciousness, before they can go to Krsna’s transcendental abode and never return. Those who attain the highest material planets, the planets of the demigods, are again subjected to repeated birth and death. As persons on earth are elevated to higher planets, people on higher planets such as Brahmaloka, Candraloka and Indraloka fall down to earth. The practice of sacrifice called pancagni-vidya, recommended in the Chandogya Upanisad, enables one to achieve Brahmaloka, but if, on Brahmaloka, one does not cultivate Krishnaconsciousness, then he must return to earth. Those who progress in Krishnaconsciousness on the higher planets are gradually elevated to higher and higher planets and at the time of universal devastation are transferred to the eternal spiritual kingdom. Baladeva Vidyabhusana, in his commentary on Bhagavad-gita, quotes this verse:
brahmana saha te sarve
samprapte pratisancare
parasyante krtatmanah
pravisanti param padam
“When there is devastation of this material universe, Brahma and his devotees, who are constantly engaged in Krishnaconsciousness, are all transferred to the spiritual universe and to specific spiritual planets according to their desires.”