SB 4.12.38

ity uttānapadaḥ putro
 dhruvaḥ kṛṣṇa-parāyaṇaḥ
abhūt trayāṇāṁ lokānāṁ
 cūḍā-maṇir ivāmalaḥ
Word for word: 
iti — thus; uttānapadaḥ — of Mahārāja Uttānapāda; putraḥ — the son; dhruvaḥ — Dhruva Mahārāja; kṛṣṇa-parāyaṇaḥ — fully Kṛṣṇa conscious; abhūt — became; trayāṇām — of the three; lokānām — worlds; cūḍā-maṇiḥ — the summit jewel; iva — like; amalaḥ — purified.
Translation: 
In this way, the fully Kṛṣṇa conscious Dhruva Mahārāja, the exalted son of Mahārāja Uttānapāda, attained the summit of the three statuses of planetary systems.
Purport: 

The exact Sanskrit terminology for Kṛṣṇa consciousness is here mentioned: kṛṣṇa-parāyaṇaḥ. Parāyaṇa means “going forward.” Anyone who is going forward to the goal of Kṛṣṇa is called kṛṣṇa-parāyaṇa, or fully Kṛṣṇa conscious. The example of Dhruva Mahārāja indicates that every Kṛṣṇa conscious person can expect to reach the topmost summit of all three planetary systems within the universe. A Kṛṣṇa conscious person can occupy an exalted position beyond the imagination of any ambitious materialist.