CC 1.3.72

advaita, nityānanda — caitanyera dui aṅga
aṅgera avayava-gaṇa kahiye upāṅga

advaita - Advaita Ācārya; nityānanda - Lord Nityānanda; caitanyera - of Lord Caitanya Mahāprabhu; dui - two; aṅga - limbs; aṅgera - of the limbs; avayava-gaṇa - the constituent parts; kahiye - I say; upāṅga - parts.

Text

Śrī Advaita Prabhu and Śrī Nityānanda Prabhu are both plenary portions of Lord Caitanya. Thus They are the limbs [aṅgas] of His body. The parts of these two limbs are called the upāṅgas.

Purport

Sri Caitanya Caritamrita. Adi-lila

Chapter 3: The External Reasons for the Appearance of Sri Caitanya Mahaprabhu. Text 72

Śrī Advaita Prabhu and Śrī Nityānanda Prabhu are both plenary portions of Lord Caitanya. Thus They are the limbs [aṅgas] of His body. The parts of these two limbs are called the upāṅgas.