om ity ekaksaram brahma
vyaharan mam anusmaran
yah prayati tyajan deham
sa yati paramam gatim
(Attaining the Supreme ,Text 13, Chapter 8)
Meaning: After being situated in this yoga practice and vibrating the sacred syllable om, the supreme combination of letters, if one thinks of the Supreme Personality of Godhead and quits his body, he will certainly reach the spiritual planets.
Bhagavad Gita: He will certainly reach the spiritual planets (Attaining the Supreme,Text 13, Chapter 8)