CC 3.16.59

kṛṣṇera ucchiṣṭa haya 'mahā-prasāda' nāma
'bhakta-śeṣa' haile 'mahā-mahā-prasādākhyāna'

kṛṣṇera ucchiṣṭa - remnants of the food of Kṛṣṇa; haya - are; mahā-prasāda nāma - called mahā-prasādam; bhakta-śeṣa - the remnants of a devotee; haile - when it becomes; mahā-mahā-prasāda - great mahā-prasādam; ākhyāna - named.

Text

The remnants of food offered to Lord Kṛṣṇa are called mahā-prasādam. After this same mahā-prasādam has been taken by a devotee, the remnants are elevated to mahā-mahā-prasādam.

Purport

Sri Caitanya Caritamrita. Antya-lila

Chapter 16: Lord Sri Caitanya Mahaprabhu Tastes Nectar from the Lips of Lord Sri Krishna. Text 59

The remnants of food offered to Lord Kṛṣṇa are called mahā-prasādam. After this same mahā-prasādam has been taken by a devotee, the remnants are elevated to mahā-mahā-prasādam.