The Lord says in Bhagavad-gītā (BG 4.9):
- janma karma ca me divyam
- evaṁ yo vetti tattvataḥ
- tyaktvā dehaṁ punar janma
- naiti mām eti so 'rjuna
"One who knows the transcendental nature of My appearance and activities does not, upon leaving the body, take his birth again in this material world, but attains My eternal abode, O Arjuna."
The result of perfection in Kṛṣṇa consciousness is that after giving up one's material body, one is immediately transferred to the spiritual world in one's original spiritual body to become an associate of the Supreme Personality of Godhead. Some devotees go to Vaikuṇṭhaloka, and others go to Goloka Vṛndāvana to become associates of Kṛṣṇa.