In the later day Vaishnava schools Lord Krishna is considered the supreme form of the Lord. This idea is supported by a verse from the Srimad Bhagwatam . The Bhagwatam while describing 24 different Avatar-s of the Lord mentions, when it comes to Krishna,
ete cāṁśa-kalāḥ puṁsaḥ
kṛṣṇas tu bhagavān svayam
indrāri-vyākulaṁ lokaṁ
mṛḍayanti yuge yuge …
ādyo ’vatāraḥ puruṣaḥ parasya
kālaḥ svabhāvaḥ sad-asan-manaś ca
dravyaṁ vikāro guṇa indriyāṇi
virāṭ svarāṭ sthāsnu cariṣṇu bhūmnaḥ
ādyaḥ — first; avatāraḥ — incarnation; puruṣaḥ — Kāraṇārṇavaśāyī Viṣṇu; parasya — of the Lord; kālaḥ — time; svabhāvaḥ — space; sat — result; asat — cause; manaḥ — mind; ca — also; dravyam — elements; vikāraḥ — material ego; guṇaḥ —…