One verse

Srimad Bhagavatam 10.1.24

10.1.24

वासुदेवकलानन्त: सहस्रवदन: स्वराट् । अग्रतो भविता देवो हरे: प्रियचिकीर्षया ॥ २४ ॥

vāsudeva-kalānantaḥ sahasra-vadanaḥ svarāṭ agrato bhavitā devo hareḥ priya-cikīrṣayā

vāsudeva-kalā anantaḥ
the plenary expansion of Lord Kṛṣṇa known as Anantadeva or Saṅkarṣaṇa Ananta, the all-pervasive incarnation of the Supreme Lord
sahasra-vadanaḥ
having thousands of hoods
svarāṭ
fully independent
agrataḥ
previously
bhavitā
will appear
devaḥ
the Lord
hareḥ
of Lord Kṛṣṇa
priya-cikīrṣayā
with the desire to act for the pleasure

The foremost manifestation of Kṛṣṇa is Saṅkarṣaṇa, who is known as Ananta. He is the origin of all incarnations within this material world. Previous to the appearance of Lord Kṛṣṇa, this original Saṅkarṣaṇa will appear as Baladeva, just to please the Supreme Lord Kṛṣṇa in His transcendental pastimes.