CC Antya 16.96
īśvara-sevaka puche, — ‘ki artha ihāra’?
The servants of the Jagannātha temple inquired, “What is the meaning of this?”
The remnants of Kṛṣṇa’s food are mixed with His saliva. In the Mahābhārata and the Skanda Purāṇa it is stated:
mahā-prasāde govinde nāma-brahmaṇi vaiṣṇave
sv-alpa-puṇyavatāṁ rājan viśvāso naiva jāyate
“Persons who are not very highly elevated in pious activities cannot believe in the remnants of food [prasādam] of the Supreme Personality of Godhead, nor in Govinda, the holy name of the Lord, nor in the Vaiṣṇavas.”