Hare Krisna mantra contains OM

It is clearly stated here that om, Brahman, and Lord Krsna are not different. The impersonal sound of Krsna is om, but the sound Hare Krsna contains om. It is clearly recommended in this age that if one quits his body at the end of this life chanting the mahamantra, Hare Krsna, he will reach the spiritual planets. Similarly, those who are devotees of Krsna enter the Krsna planet or Goloka Vrndavana, whereas the impersonalists remain in the brahmajyoti. The personalists also enter many innumerable planets in the spiritual sky known as Vaikunthas.    (More...)

"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." (Bg. 8.13) In this way all the senses have to be stopped in their external activities, and the mind must be concentrated on vimumurti, the form of Lord Visnu. That is the perfection of yoga. The mind is very turbulent, so it has to be fixed upon the heart. When the mind is fixed within the heart and the life air is transferred to the top of the head, one can attain the perfection of yoga.    (More...)