SB 4.25.51
devahur nama purya dva
uttarena purañjanah
rastram uttara-pañcalam
yati srutadharanvitah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
On the northern side was the gate named Devahu. Through that gate, King Purañjana used to go with his friend Srutadhara to the place known as Uttara-pañcala.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The two ears are situated on the northern side and the southern side. The ear on the southern side is very strong and is always anxious to hear about sense enjoyment. The ear on the northern side, however, is used for taking initiation from the spiritual master and for gaining promotion to the spiritual sky. The right ear, or the ear on the southern side, is called Pitrhu, which indicates that it is used for attaining the higher planetary systems known as Pitrloka, but the left ear, which is known as Devahu, is utilized for hearing about even higher planetary systems, such as Maharloka, Tapoloka and Brahmaloka — or yet even higher planets, situated in the spiritual universe, where one becomes more inclined to be permanently situated. This is explained in Bhagavad-gita (9.25):
yanti deva-vrata devan
pitrn yanti pitr-vratah
bhutani yanti bhutejya
yanti mad-yajino ’pi mam
“Those who worship the demigods will take birth among the demigods; those who worship ghosts and spirits will take birth among such beings; those who worship ancestors go to the ancestors; and those who worship Me will live with Me.”
One who is interested in being happy on this planet as well as after death generally wants to be elevated to the Pitrlokas. Such a person can use the right ear for hearing Vedic instructions. However, one who is interested in going to Tapoloka, Brahmaloka, the Vaikuntha planets or Krsnaloka may take initiation from the spiritual master in order to be elevated to such lokas.