CC Ādi 1.8

māyātīte vyāpi-vaikuṇṭha-loke
pūrṇaiśvarye śrī-catur-vyūha-madhye
rūpaṁ yasyodbhāti saṅkarṣaṇākhyaṁ
taṁ śrī-nityānanda-rāmaṁ prapadye
Synonyms: 
māyā-atīte — beyond the material creation; vyāpi — all-expanding; vaikuṇṭha-loke — in Vaikuṇṭhaloka, the spiritual world; pūrṇa-aiśvarye — endowed with full opulence; śrī-catuḥ-vyūha-madhye — in the quadruple expansions (Vāsudeva, Saṅkarṣaṇa, Pradyumna and Aniruddha); rūpam — form; yasya — whose; udbhāti — appears; saṅkarṣaṇa-ākhyam — known as Saṅkarṣaṇa; tam — to Him; śrī-nityānanda-rāmam — to Lord Balarāma in the form of Lord Nityānanda; prapadye — I surrender.
Translation: 
I surrender unto the lotus feet of Śrī Nityānanda Rāma, who is known as Saṅkarṣaṇa in the midst of the catur-vyūha [consisting of Vāsudeva, Saṅkarṣaṇa, Pradyumna and Aniruddha]. He possesses full opulences and resides in Vaikuṇṭhaloka, far beyond the material creation.